10 Best Outdoor Drain Cleaners And Unblockers in The UK

Last updated on 22/07/2025

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Best Choice

9.8

Exceptional

Spear & Jackson

Spear Jackson Heavy Duty Sink and Drain Unblocker Gel - Powerful Formula- Indoor and Outdoor, 5 l (Pack of 1)

Why We Love It

Effective on tough blockages.
Safe for all pipes.
Experienced, reputable brand.

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

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.

One Chem Professional Heavy Duty Drain Unblocker 2 x 5 Litres, Clears Grease, Fat, Food Deposits, Indoor and Outdoor Use

3% Off

Why We Love It

Powerful and effective formula.
Reduces build-ups and blockages.
Easy and safe usage.

Main Highlights

Powerful Formula: One Chem Heavy Duty Indoor and Outdoor Drain Unblocker is a specially formulated liquid that clears grease, fat, and food deposits in drains, gulleys, and waste outlet pipes.
Maintenance: This liquid also helps maintain sinks and drains to reduce build-ups and blockages.
Usage Instructions: Wear gloves, place bottle on a flat surface, push down on the cap and turn anti-clockwise, pour 500ml of liquid down the drain taking care not to splash in eyes, allow to dwell for a minimum of 3 hours but preferably overnight, then flush with plenty of water.
Effective Dwell Time: For best results, allow the liquid to dwell for as long as possible, with a minimum of 3 hours but preferably overnight.

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

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.

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.

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

HG drain odour remover 0.5kg

Free Shipping

Why We Love It

Effectively cleans and deodorises drains.
Removes deposits causing smell.
Easy and efficient usage.

Main Highlights

HG Drain Odour Remover: Effectively cleans & de-odourises smelly kitchen or bathroom drains in just 30 minutes, leaving them smelling fresh again
For sinks, drains, toilets & shower trays: Drains can become smelly because of deposits on their walls. Fortunately this drain odour eliminator removes the deposits that cause the smell
Enough for 10 treatments: Safe for use in the home. Works fast, removes nasty niffs & lets the water flow freely again. Ideal for the bathroom, shower, utility & washbasin drains
Effective & easy to use: The self-acting smell remover formula does the hard work, so you don’t have to. No additional tools are required & sinks will be odour-free again
500ml HG Drain Odour Remover: Rinse the drain first with hot water. Add 50g (5 caps) of odour remover granules directly to the drain. Leave for 30 minutes & rinse thoroughly 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)

Free Shipping

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

Jeyes Drain Unblocker, Powerful Outdoor Cleaning Fluid, Cleans and Deodorises, 1 Litre

11% Off

Why We Love It

Eliminates tough drain blockages.
Works quickly with minimal fuss.
Easy and efficient to use.

Main Highlights

We know the last thing you want is the hassle of a blocked drain, so if your drain starts to smell or clog up, then the powerful, thick cleaning formula is more than up to the task
Working in minutes, Jeyes Drain Unblocker is a drain cleaner and deodoriser that is ideal for cleaning all outside drains quickly and with minimal fuss
Our unique formula and powerful cleaning action eliminates tough blockages and fully blocked drains
Tough on grease, hair, soap scum, food and decaying leaves etc. Our powerful, thick, clinging formula cleans and deodorises in 30 minutes so you can clean clever
Easy to use, simply pour liberally into the drain and leave for 30 minutes, or overnight for tough blockages, then rinse thoroughly with water. For outdoor use only

8.8

Excellent

Save 11%

We scanned 1565 products

We reviewed these offers relevant to the Outdoor 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 Spear & Jackson, Inovix, One Chem, Pluto Packaging, STORM TRADING GROUP, Zep, HG, Mr Muscle, Jeyes, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Outdoor Drain Cleaners And Unblockers in the market, we considered we took a deep dive into 7826 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 Spear Jackson Heavy Duty Sink and Drain Unblocker Gel - Powerful Formula- Indoor and Outdoor, 5 l (Pack of 1). We love many things about this product by Spear & Jackson. What sets it apart from the competition is Effective on tough blockages, Safe for all pipes, Experienced, reputable brand.
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 Outdoor Drain Cleaners And Unblockers and the best cost-to-value ratio is Jeyes Drain Unblocker, Powerful Outdoor Cleaning Fluid, Cleans and Deodorises, 1 Litreat Jeyes with a 11% discount.
Our list of the best Outdoor 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 Outdoor Drain Cleaners And Unblockers in The UK

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We scanned 1565 products

We concluded that: