10 Best Outside Drain Cleaners And Unblockers in The UK

Last updated on 28/08/2025

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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

Cillit Bang 3-in-1 Power Cleaner Odour Stop Drain Unblocker Gel, Drain Cleaner For Kitchen Sink Drains, Bathroom Showers, Baths & Basins (Pack of 5)

Why We Love It

Works in just 5 minutes.
Eliminates odour-causing bacteria.
Recyclable bottle packaging.

Main Highlights

WORKS IN 5 MINUTES: Cillit Bang 3-in-1 Power Cleaner Odour Stop Drain Unblocker Gel has a powerful formula that works in as little as 5 minutes; It specifically build up of sludge, dirt or other materials and breaks them up, keeping your pipes clean and water flowing freely
CLEANS AND FRESHENS: Cillit Bang's odour-eliminating gel targets odour-causing bacteria that live in your kitchen sink drains, bathroom showers, baths and basins
WORKS EVEN IN STANDING WATER: Cillit Bang 3-in-1 Drain Unblocker Gel unblocks, freshens and deep cleans your drains, even in standing water
SAFE FOR ALL PIPES: Our powerful drain unblocker gel only gets to work on nasty blockages building up in your drains and leave your pipes cleaner and fresher than before
BOTTLE CAN BE RECYCLED

Spear & Jackson - Heavy Duty Sink And Drain Unblocker Gel - 2 x 5 Litres - Clears Blocked Drains

3% Off

Why We Love It

Effective on tough blockages.
Easy to use gel formula.
Trusted brand with heritage.

Main Highlights

SPEAR & JACKSON CLEANING PRODUCTS: Since 1760 Spear and Jackson has been selling hand, garden, contractors, agricultural, landscaping and professional tools from its base in the city of Sheffield. Their range of cleaning products are made to target tough stains, grease, grim and fat. Their Heavy Duty Outdoor Drain Unblocker Gel is designed to clear any deposits that are blocking your sink, leaving it draining smoothly
SINK UNBLOCKER LIQUID GEL: Spear and Jackson's Heavy Duty Sink And Drain Unblocker comes in gel form and is designed to dissolve the fat, food, hair or soap residue build up that's blocking your sink. Their heavy duty sink and drain unblocker gel will instantly clear and dissolve the unwanted blockage, and with the sink freshener element of the gel, your sink will be look and smell brand new
BATHROOM & KITCHEN SINK UNBLOCKER: With no drain snake require, this product really couldn't be any easier to use. The gel will dissolve any build up that is causing a blockage in your sink or drain in 3 hours. Ideal for the kitchen or bathroom sink, however this Heavy Duty Sink & Drain Unblocker works on exterior drains just as well. In comparison to other drain cleaners and unblockers on the market, this product has a powerful formulation that achieves results in rapid speed
BATHROOM CLEANING PRODUCTS: Spear and Jackson's fast acting, powerful and effective sink and drain unblocker liquid is perfectly safe to use on all pipe types. For the best results, pour the heavy duty drain unblocker down the plughole, leave for a minimum of 3 hours (preferably overnight) and finish off by flushing the drain with hot water for at least 2 minutes to completely free any blockages - it's really that easy!
SPEAR & JACKSON: With over 250 years experience and continuous innovation, Spear and Jackson have built an enviable reputation with their market leading products that offer high quality performance tools to suit a wide range of needs. Whether you're looking to unblock your sink drain or a concentrated mould, algae and moss spray then shop Spear and Jackson range of versatile, effective and long lasting cleaning products

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.

Powerful Caustic Soda Drain Cleaner | Effective Clog Remover, Industrial Strength Formula, Fast Action (3 X 375gm) (Packaging may vary)

Why We Love It

Generous 1125gm total quantity.
Convenient 3-bottle packaging.
Simple delivery information.

Main Highlights

Product Quantity : 1125gm (375g x 3 Bottles) , & 1 KG
Delivry nfo : We cannot deliver certain products outside mainland UK ( Details). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout.

Zep Drain Bioclean & Odour Control - 1l, Drain Unblocker For Preventive Maintenance To Keep Drains Unblocked, Perfect For Bad Smells, Sink Cleaner For Smelling Sinks, Zep Commercial

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Why We Love It

Eco-friendly drain care solution.
Prevents odour problems efficiently.
Tackles tough blockages steadily.

Main Highlights

An easy and eco-friendly way to look after your drains, the best thing for smelly drains.
Enzyme-based formula prevents odour problems in the drain.
Perfect for regular maintenance – simply use 30-60ml every two weeks.
Slowly works through tougher blockages.
Blocked drains require 500ml followed by 500ml of warm water, and a 6-8 hour wait.
Safe for use in all drains around the home.
Works best when applied at night for preventative maintenance.

Zep Commercial Unblocker Heat Drain Liquid

8% OffFree Shipping

Why We Love It

Melts blockages for easy drain.
Battles grease, fat effortlessly.
Safe for plastic components.

Main Highlights

Heavy duty formulations melts tough blockages
destroys grease, fat &amp
food build-up effortlessly
this professional-strength formula is safe for Plastic pimples
Destroys grease, fat & food build-up effortlessly
This professional-strength formula is safe for Plastic pimples

Kitchen Drain Unblocker – Extra Strong Formula – Rapid Action Cleaner & Odour Remover – Removes Blockages Fast – 5 Doses Heavy Duty Problem Solver

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Why We Love It

Clears clogs extremely fast.
Gentle on pipes.
Prevents bad odours.

Main Highlights

DON’T WASTE YOUR TIME ON drain cleaners and unblockers that DON’T CLEAR CLOGS EFFECTIVELY. Plumbo EXTRA STRONG drain unblocker for kitchen sinks and drains is 3-component rapid action powder formula which blasts through blockages more effectively than any liquid or gel drain unblockers. It is formulated to DISSOLVE waste, human & pet hair, and BLOCKAGES caused by food debris, fat, grease, soap. It’s your GO-TO sink and drain unblocker for CLOGGED DRAINS from the kitchen sink.
UNLIKE WEAK, WATERY KITCHEN drain unblocker formulas, our Plumbo HEAVY DUTY pipe unblocker is designed to CUT THROUGH STANDING WATER to target food and fat build up, the main causes of KITCHEN BLOCKAGE. It dissolves food remains, grease, hair, and soap scum and open blockages FAST. With 5 USES PER BOTTLE, this heavy duty drain unblocker liquid formula helps PREVENT BAD ODOURS, and works especially well in KITCHEN SINKS AND DRAINS.
POWERFUL YET GENTLE ON PIPES. Our RAPID ACTION and NON-ACID proprietary formula is uniquely formulated to OPEN DRAINS QUICKLY WITHOUT DAMAGING pipes – including porcelain, brazed joints, enamel, or septic tanks. This heavy duty drain unblocker can be used in ALL MODERN PLASTIC PIPES made of polypropylene, polyethylene, and PVC. Do not use our KITCHEN UNBLOCKER in washing machines or dishwashers, and avoid spilling on composite sinks, aluminum, gold, brass, and anodized objects.
Plumbo drain unblocker will CLEAR CLOGS QUICKER and more EFFECTIVELY than any other NON-ACID FORMULAS. Whether it's the TOUGHEST FULL BLOCKAGE or slow draining water, the Plumbo powder gets to work EXTREMELY FAST, and makes the kitchen plugholes FREE FLOWING again. 5 DOSES PER BOTTLE. Follow the instructions on the label thoroughly, and pour the suggested amount of drain unblocker POWDER down your drain and LET SIT for UP TO 30 MINUTES. Flush with plenty of hot or boiling water.
AT PLUMBO, WE’RE COMMITTED TO providing you with POWERFULLY EFFECTIVE drain unblockers that GET THE JOB DONE RIGHT. As a trusted brand from Norway SINCE 1909, our potent kitchen sink unblocker is a unique 3-COMPONENT formula that CLEARS CLOGS EXTREMELY FAST, WITHOUT DAMAGING your plumbing – for THE STRONGST NON-ACID drain unblocker you can always count on. WE PUT OUR CUSTOMERS FIRST – if for any reason you aren’t satisfied with your drain unblocker hair liquid, our team is standing by to help.

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

8% Off

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.

DKBT Drain Unblocker Wire Tools 5M*6mm Professional Kitchen Sink Unblocker Tool Flexible Plug Unblocker Gadget Drain Hair Remover Drain Auger Plumbing Snake with Claw for Pipe Cleaning, Blue

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Why We Love It

Effective pipe cleaning solution.
Environmentally friendly and safe.
Ergonomic and easy handling.

Main Highlights

Effective blocking intervention: The pipe cleaner spiral is an effective product to extinguish debris and residues from the sink or drainage. For most pipes in the household and outside such as shower outlet and sewage canals, sink channel.
Environmentally friendly cleaning spiral: An ecological solution for blocked drains and rinsing, which is an optimal alternative to chemical substances that is harmless to the environment and user.
Ergonomic design: This channel spiral is flexible enough to deal with every bend and design with a plastic handle for simple handles.
Dimensions of the drain spiral: Length: 5 m, diameter: 6 mm, which means that it can be inserted into most clogged tubes.
Easy to use: Slowly insert the spiral drain pipe cleaning into the blocked drain and turn the crank until the blockade is reached, and turn the handle clockwise to grab the blockade and finally increase the drainage probe. Effectively and quickly solve the stubborn constipation.

8.9

Excellent

We scanned 377 products

We reviewed these offers relevant to the Outside 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, Cillit Bang, Spear & Jackson, STORM TRADING GROUP, EasyClean, Zep, PLUMBO, Pluto Packaging, DKBT, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Outside 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 Cillit Bang 3-in-1 Power Cleaner Odour Stop Drain Unblocker Gel, Drain Cleaner For Kitchen Sink Drains, Bathroom Showers, Baths & Basins (Pack of 5) by Cillit Bang based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Outside Drain Cleaners And Unblockers and the best cost-to-value ratio is Strong Heavy Duty Industrial Sink & Drain Unblocker Cuts Through Standing Water Fast Effect 5 Litre Cleaner (1 x 5 Litre)at Pluto Packaging with a 8% discount.
Our list of the best Outside 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 Outside Drain Cleaners And Unblockers in The UK

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We scanned 377 products

We concluded that: