10 Best Heavy Duty Toilet Drain Cleaners And Unblockers in The UK

Last updated on 18/07/2025

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Green Gobbler - Main Line Drain Opener - Toilet Unblocker, Dissolve Hair & Organic Materials from Clogged Toilets, Sinks and Drains - Drain Cleaner and Unblocker - 3,8 L

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Why We Love It

Efficiently dissolves common clog sources.
Multipurpose and septic-safe.
Assures 30-day money back.

Main Highlights

Dissolves Tough Clogs: Green Gobbler's powerful formula clears clogged drains by dissolving hair, soap, toilet paper, flushable wipes, and other organic materials, eliminating the need for plunging
Versatile Use Drain Cleaner: Safe for use in pipes, toilets, sinks, tubs, and showers. The non-corrosive formula is also safe for septic systems and does not contain bleach or sodium hydroxide
High-Density Formula: The thick, high-density formula sinks through standing water to reach problem areas, ensuring effective clog removal without damaging PVC, ABS, copper, or cast-iron pipes
Easy Application: The pre-measured formula makes it simple to use with no measuring required. Just pour, wait, and rinse for quick results
How to Use: Pour entire bottle into the toilet on the first floor. Close lid and flush once to distribute the product through the pipes. Overnight use for best results

Inovix® 5 Litre Heavy Duty Drain Unblocker | Sink Unblocker | Fast-Acting Solution for Sinks, Toilets, Showers Removes Hair & Sludge | Industrial Drain Unblocker Ideal For Indoor And Outdoor Drains

Why We Love It

Powerful unblocker for tough clogs.
Fast-acting formula for quick results.
Safe for all pipe types.

Main Highlights

✅ Powerful Drain Unblocker for Home & Commercial Use – Inovix heavy duty drain unblocker tackles even the toughest blockages. Designed for sinks, toilets, showers, and bathroom drains, it restores fast-flowing water in minutes.
✅ Fast-Acting Sink & Shower Drain Unblocker – Say goodbye to standing water! This powerful sink unblocker liquid formula gets to work quickly, dissolving hair, soap scum, and sludge in kitchen sinks, plugholes, and bathroom drains.
✅ Eliminates Bad Smells & Keeps Drains Fresh –Removes Odours & Freshens Pipes This strong drain cleaner not only unblocks but also deodorises. Idle Drain cleaner for bad smells lingering odours caused by sludge, stagnant water, and food debris.
✅ Multi-Purpose & Pipe Safe Formula – Use in bathrooms, kitchens, garages, shops, and more. Safe for ceramic, metal , plastic pipes, and septic tanks too, making it your go-to outdoor drain unblocker tool for regular maintenance.
✅ Industrial Strength Drain Cleaner – Made with high-performance cleaning agents, our 5L solution offers industrial-level power. Cuts through grease, food waste, fat, and organic build-up in residential or commercial settings.
✅ Simple to Use – No Tools Needed – No Tools or Plumbers Needed Just pour 1L of our powerful unblocker liquid directly into the affected area. Leave for 5–30 minutes (or overnight for tough blockages), then flush with hot water.
✅ Large 5 Litre Value Pack – Supplied in a generous 5L container, Inovix provides long-lasting use and great value. Ideal for households, landlords, cleaners, and facilities management teams.

5 Litre Heavy Duty Sink & Drain Unblocker Strong Cleaning Liquid Plug Hole Toilet Cleaner Tool For Home, Office, Garage & Shops (1 x 5 Litre)

Why We Love It

Unclogs sinks rapidly under 5 minutes.
Super-strength formula clears stubborn blockages.
Safely maintains all types of drains.

Main Highlights

SINK & DRAIN UNBLOCKER: However much you try, sometimes food, hair or other blockages might fall down your sink or drains. Luckily, our sink and drain unblocker will help you get those clogs shifted. Soon you’ll be able to take a shower without it filling up with water or wash up in your kitchen sink without the dirty water getting stuck. Our Sink and Drain unblocker is the fast and effective way to unclog your sinks and drains with one dose. Gets to work really fast in under 5 minutes.
POWERFUL FORMULA: Power through blockages in your drain with our super-strength drain unblocker solution. It's a home essential and can be used on sinks, showers, and outdoor drains. It powers through to the source of the blockage to resolve the issue and give you free running water again. Use regularly to ensure pipes and drains remain problem free.
MULTI USE: Protect your sinks and drains by using this drain unblocker on a regular basis. Out solution is safe for use on all pipes, its perfect for the home, office, workplace, shops and canteens.
SIMPLE TO USE: Add 1 Litre of product to the affected sink or drain and allow the solution to work for at least 5 minutes. For best results, leave for up to 30 minutes and then flush through with hot water. Simple select the amount required from the menu above.

Eco Drain Cleaner from Plumbo - Safe and Effective Probiotic & Enzyme Formula for Mild to Moderate Blockages, Non-Toxic and Eco-Friendly, Breaks Down Grease and Organic Waste, Odour Neutralizer, 1 L

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Why We Love It

Cleans and deodorises effectively.
Eco-friendly and safe.
Powerfully effective results.

Main Highlights

OTHER DRAIN UNBLOCKERS promise to keep drains clear – but then wind up not working and MAKING BLOCKAGES WORSE. Plumbo Naturent Drain Cleaning gel is formulated with PROBIOTICS and 3 TYPES OF ENZYMES that “DIGEST” the waste, oils, fats, food residue, soap scum and TOILET TISSUE that accumulates in your drains on a daily basis, effectively BREAKING THEM DOWN and clearing them away.
DON’T SETTLE FOR drain cleaners that DON’T DO ANYTHING to improve the FOUL ODOURS in your pipes, or just DEODORISES or MASKING THE BAD ODOUR. Our drain sink unblocker effectively ELIMINATES offensive smells in pipes and drains AT THE SOURCE, keeping your SINKS SMELLING FRESH. Made for use in ALL TYPES OF PIPES and septic tanks – and SAFE for you, your family and aquatic life, too!
BETTER FOR THE PLANET – ECO FRIENDLY Made with NATURALLY OCCURRING ENZYMES and PROBIOTICS, this SUSTAINABLE drain cleaner break down waste and keep pipes and drains 100% clean WITHOUT harmful chemicals, NON-CORROSIVE AND BLEACH-FREE. Safe for use in ALL TYPES OF PIPES, toilets and septic tanks, also mobile toilets, caravan, boats etc.
150% more NATURALLY occurring ENZYMES and PROBIOTICS than most other biological drain cleaners. Breaks down and dissolves all organic waste, which can clog up or stagnate in drains and toilets, i.e grease, food residues, soaps, and toilet paper. To be used preventive to avoid clogging, and when flow or odour issues start to appear.
AT PLUMBO, WE’RE COMMITTED to providing you with POWERFULLY EFFECTIVE eco cleaning products that GET THE JOB DONE RIGHT. As a TRUSTED BRAND from Norway SINCE 1909, our kitchen, bath, and shower drain unblocker is a UNIQUE, NATURAL way to keep drains clear & fresh. WE PUT OUR CUSTOMERS FIRST – if for any reason you aren’t satisfied with your sink cleaner, our team is standing by to help.

Powerful Drain Cleaner & Unblocker l 1KG Caustic Soda | Fast-Acting, Heavy-Duty Sink & Drain Cleaner | Strong & Effective | The Original & Best l Works 3x Better Than Bleach (Packaging Varies)

Why We Love It

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Main Highlights

Drain cleaners and unblockers 1KG Caustic Soda Drain Cleaner Caustic Soda Powder Sink and Drain cleaner strong the original and best drain cleaner kitchen drain unblocker
Product type: DRAIN OPENER SUBSTANCE
Power unblocker to destroy the toughest clogs in your drain
3x stronger than bleach in removing hair-based clogs
Penetrates standing water to clear blocked drains quickly
Safe for all types of plumbing systems
Industrial Strength Formula, Fast Action
Brand : The Retail Heaven

Powerfully clears stubborn clogs.
Safe for all pipes.
Offers rapid, efficient results.

Main Highlights

MULTIWARE POWERFUL DRAIN UNBLOCKER - Experience the strength of MultiWare's industrial-grade formula, specifically engineered to dissolve stubborn clogs quickly and efficiently. This powerful cleaner tackles everything from hair and soap scum to grease and food particles, ensuring your drains are free-flowing and clean.
SAFE FOR ALL PIPES - MultiWare Sink and Drain Unblocker is thoughtfully formulated to be safe for use in all plumbing systems. Whether your home uses modern PVC, traditional copper, or older metal piping, you can trust our product to clear clogs without causing any damage or corrosion.
RAPID RESULTS - Get quick results when time is of the essence. Our unblocker works within minutes to remove obstructions and restore optimal flow to slow drains, saving you both time and frustration. Simply follow the easy instructions for immediate relief.
EASY TO USE - Avoid expensive plumber calls with MultiWare's easy-to-use drain solution. Our clear, step-by-step guide allows anyone to professionally handle drain maintenance. Just pour the recommended amount into the drain, wait for the formula to work its magic, and rinse away the residues.
VERSATILE APPLICATIONS - Not just for kitchen sinks, MultiWare's Drain Unblocker is also effective in bathrooms, on shower drains, and even outdoor drains exposed to leaves and debris. Its versatility makes it a must-have in any home or commercial setting to tackle a variety of blockage issues.

Strong Heavy Duty Industrial Sink & Drain Unblocker Cuts Through Standing Water Fast Effect 5 Litre Cleaner (1 x 5 Litre)

Why We Love It

Unclogs water in minutes.
Effective on various drains.
Safe for all pipes.

Main Highlights

5 Litre heavy duty industrial sink and drain unblocker is designed to cut through standing water that has been caused due to food being trapped in drain pipes or either a build up of hair stuck in showers. It effectively unclogs your sinks in just one dose and gets to work in less than 5 minutes so you can have running water again.
The powerful formula cuts through standing water, clogged toilets and sinks, this is a essential cleaning product used in most homes, offices, workplaces, canteens and shops.
Sink and drain unblocker can be used for sinks, showers, toilets, drains, outdoor drains it powers through to the source of the blockage to resolve the issue and give you free running water again.
We recommend you use this on a regular basis to ensure pipes and drains remain problem free, our solution is safe for use on all pipes and is very easy to use simply add 1 Litre of product to the affected sink or drain and allow the solution to work for at least 5 minutes. For best results, leave for up to 30 minutes and then flush through with hot water.

Mr Muscle Drain Unblocker, Sink & Drain Cleaner, Fast Acting Heavy Duty Gel Formula, Dissolves Clogs, Works 3x Better Than Bleach, Safe for All Pipes, Duo Pack, (2 x 1L)

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Why We Love It

Powerfully tackles tough clogs.
Quick-action, efficient unblocking.
Safe for all pipes.

Main Highlights

Sink power unblocker to destroy the toughest clogs in your drain
Blocked drain cleaner for dissolving clogs caused by debris in sinks, plugholes and pipes
3x more effective than bleach as a pipe unblocker based on hair removal in laboratory testing
Cuts through standing water to unblock plugholes
Mr Muscle drain unblocker is safe for use on all types of pipe

Mr Muscle Drain Unblocker, Sink & Drain Cleaner, Heavy Duty Drain Gel, 2 x 500 ml

30% OffFree Shipping

Why We Love It

Powerful sink clog solution.
Efficient blockage removal strength.
Safe for all pipes.

Main Highlights

Sink unblocker to destroy the toughest clogs in your drain
Blocked drain cleaner for dissolving clogs caused by debris in sinks, plugholes and pipes
3x more effective than bleach as a pipe unblocker based on hair removal in laboratory testing
Cuts through standing water to unblock plugholes
Mr Muscle Drain Unblocker is safe for use on all types of pipes

HG Drain & Plug Unblocker Gel, Effective Cleaner & Sink Clog Remover & Toilet Unblocker, Heavy Duty Sink & Plug Hole Treatment - 1 Litre, Packaging may vary

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Why We Love It

Highly effective for stubborn blockages.
Versatile for various waste pipes.
Fast-acting and easy-to-use.

Main Highlights

HG Drain & Plug Unblocker Gel: A highly effective drain unblocker, heavy duty, suitable for unclogging blocked drain pipes in sinks, basins, bathtubs or shower traps to restore the free flow of water
Universal sink or bathroom plug unblocker: Suitable for all types of waste pipes, making it a versatile choice for your household needs, removing hair, soap scum, toilet paper or other blockages
Fast acting gel: The indoor or outside drain unblocker gets to work quickly, in under 30 minutes. Safe for plastic pipes, so you can use it with confidence knowing it won't harm your plumbing
Easy to use: The heavy duty drain unblocker and plug hole unblocker removes even stubborn blockages quickly and easily. No dilution required, no messy granules and no boiling water needed
Includes: 1 x HG Drain Unblocker Gel, 1L. Discover the full range of HG cleaning products, including HG Grout Cleaner, mould remover, HG Limescale Remover and all surface cleaners

8.9

Excellent

We scanned 377 products

We reviewed these offers relevant to the Heavy Duty Toilet Drain Cleaners And Unblockers within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Green Gobbler, Inovix, STORM TRADING GROUP, PLUMBO, The Retail Heaven, MultiWare, Pluto Packaging, Mr Muscle, HG, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Heavy Duty Toilet Drain Cleaners And Unblockers in the market, we considered we took a deep dive into 1886 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Green Gobbler - Main Line Drain Opener - Toilet Unblocker, Dissolve Hair & Organic Materials from Clogged Toilets, Sinks and Drains - Drain Cleaner and Unblocker - 3,8 L. We love many things about this product by Green Gobbler. What sets it apart from the competition is Efficiently dissolves common clog sources, Multipurpose and septic-safe. , Assures 30-day money back.
The best value product for most shoppers and where user satisfaction is continuously the highest is Inovix® 5 Litre Heavy Duty Drain Unblocker | Sink Unblocker | Fast-Acting Solution for Sinks, Toilets, Showers Removes Hair & Sludge | Industrial Drain Unblocker Ideal For Indoor And Outdoor Drains by Inovix based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Heavy Duty Toilet Drain Cleaners And Unblockers and the best cost-to-value ratio is Mr Muscle Drain Unblocker, Sink & Drain Cleaner, Heavy Duty Drain Gel, 2 x 500 mlat Mr Muscle with a 30% discount.
Our list of the best Heavy Duty Toilet Drain Cleaners And Unblockers is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Heavy Duty Toilet Drain Cleaners And Unblockers in The UK

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Buster Bathroom Drain Unblocker 300ml, Pack of 3 – Sink Unblocker Removes Hair & Sludge in Showers, Baths & Sinks. Fast-Acting Shower Drain Unblocker Clears Blockages & Slow-Draining Water

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Drain Unblocker - 3 Doses Heavy Duty Gel Formula – Dissolves Hair, Grease & Waste – Odour Remover, Gentle on Pipes by Plumbo

Mr Muscle Drain Unblocker, Sink & Drain Cleaner, Fast Acting Heavy Duty Gel Formula, Dissolves Clogs, Works 3x Better Than Bleach, Safe for All Pipes, 500ml

STARWAX Super Powerful Drain Unblocker Gel – 30% Caustic Soda – Works in Standing Water – Fast 30 Min Action – Thick Formula – Kitchen & Bathroom – 1L = 2 Uses

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2 x 500ml Outdoor Drain Cleaner Unblocker Fast Acting - Unblocks & Deodorises

We scanned 377 products

We concluded that: