In this guide we’ll look at the best drain unblockers.
We’ve compared formulation, size, ease of use and cost
to give you our top recommendations.

What is the Best Drain Unblocker?

IMAGERECOMMENDED PRODUCTSPRODUCTFEATURES
  • Best drain unblocker for hair
  • Strong and effective formulation
  • 3L of product included
  • Best bath drain unblocker
  • Use as treatment or preventative
  • Dissolves hair and clears sludge
  • Best fast acting sink unblocker
  • 3x more effective than bleach
  • Cuts through standing water
  • Best for tough blockages
  • Up to 12 treatments included
  • Extremely strong formula
  • Best value unblocker
  • Unblocks within 30 minutes
  • Just 300ml needed

More Detailed Drain Unblocker Reviews

Scotch Corporation Hair & Grease Remover for Drains

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FEATURES
  • Best drain unblocker for hair
  • Strong and effective formulation
  • 3L of product included
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Scotch Corporation Hair & Grease Remover for Drains Review

The Scotch Corporation Hair & Grease Remover for Drains is the best shower drain unblocker on the market. Designed to dissolve clogs of hair from drains and melt grease from kitchen sinks, this unblocker is versatile and highly efficient.

Boasting the strongest formulation on the market, this drain unblocker will save you expensive plumber call outs. Safe for all piping, this easy-to-use product will work in just a few minutes.

If you’re looking for the best drain unblocker liquid on the market, this 3-pack of 1L Scotch Corporation Hair & Grease Remover is our top recommendation!

Buster Bathroom Plughole Unblocker

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FEATURES
  • Best bath drain unblocker
  • Use as treatment or preventative
  • Dissolves hair and clears sludge
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Buster Bathroom Plughole Unblocker Review

The Buster Bathroom Plughole Unblocker is the best drain unblocker for bathrooms, dissolving both hair and soap scum. This unblocker contains less than 5% chlorine-based bleaching agents, so it won’t damage your pipes or surfaces.

This unblocker can be used in two ways. First you could use it to remove blockages by slow draining, by pouring the whole bottle down the plughole and leaving it overnight. Or use a small amount every week to prevent blockages from occurring.

This unblocker comes with six 300ml bottles. If you’re looking for the best bathroom drain unblocker, the Buster Bathroom Plughole Unblocker is the one for you!

Mr Muscle Sink and Plug Unblocker

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FEATURES
  • Best fast acting sink unblocker
  • 3x more effective than bleach
  • Cuts through standing water
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Mr Muscle Sink and Plug Unblocker Review

Mr Muscle is one of the best household brands for drain cleaning, and this Mr Muscle Sink and Plug Unblocker is their toughest yet. Designed to destroy even the toughest blockages in your drain, this unblocker turns a tricky job into a quick and easy task.

This unblocker is 3 times more effective than bleach, even cutting through standing water to unblock your plughole. It’s safe to use on all types of pipe and gets to work in just 5 minutes.

This unblocker is available as a set of 2, with 500ml of unblocking gel in each bottle. If you’re looking for the toughest and fastest acting sink unblocker on the market, the Mr Muscle Sink and Plug Unblocker is our top recommendation!

Pro-Kleen Sink & Drain Unblocker

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  • Best for tough blockages
  • Up to 12 treatments included
  • Extremely strong formula
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Pro-Kleen Sink & Drain Unblocker Review

The Pro-Kleen Sink and Drain Unblocker is arguably the strongest unblocker on the market, offering excellent value for money. A whopping 20 times stronger than many of its competitors, this unblocker is perfect for seriously tough and stubborn blockages.

Completely dissolving grease and hair, this unblocker will have your water flowing smoothly in just a few minutes. It contains sodium and potassium hydroxide for added strength, although you should take care when using it.

This set of unblockers contains enough solution for up to 12 treatments. If you’re looking for the best drain unblocker for seriously tough blockages, the Pro-Kleen Sink & Drain Unblocker is our winner!

HG Liquid Drain Unblocker

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  • Best value unblocker
  • Unblocks within 30 minutes
  • Just 300ml needed
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HG Liquid Drain Unblocker Review

The HG Liquid Drain Unblocker is a fast-acting drain unblocker, well worthy of a mention. This unblocker is designed for every type of waste pipe, whether it’s your kitchen sink, bath plughole or shower.

This unblocker doesn’t foam or splash when poured into the drain, clearing your blockage within 30 minutes. This liquid formula won’t make the blockage worse, like granular unblockers sometimes do.

This drain unblocker lasts longer than others on the market, with just 300ml needed to unblock most common blockages. If you’re looking for a great value and effective drain unblocker, the HG Liquid Drain Unblocker is our top recommendation!

Drain Unblocker Buyer’s Guide

A blocked drain is a common occurrence in most households, as dirt, debris, hair and grease build up in your pipework. But a blocked drain doesn’t have to be a total disaster: many drain unblockers can quickly clear the most stubborn blockages.

Not sure what to look for when it comes to the best drain unblocker? Check out this buyer’s guide.

Formulation

Drain unblockers are usually in granular or liquid form. Liquid unblocking agents tend to be the most effective, as granular agents can do more harm than good. That’s because they sometimes sit on top of the blockage and make it worse.

The formula used in the drain unblocker will determine what it’s best for. Those for kitchen sinks may not be good at dissolving hair, while those for bathroom drains may not tackle grease so well. Drain unblockers with a caustic formula will produce heat to melt grease and gunk. Enzyme-based unblockers can take longer to work, but they are safer to handle.

Size

While a large bottle of formula may seem like the best option, you should look at how much product needs to be used in one treatment. Many drain unblockers are expensive, and to effectively unblock the sink, the entire bottle of solution needs to be used at once.

To make sure you save money, look to see how many treatments your sink unblocker contains. Ensure that the unblocker you buy is the right strength for the job.

Ease of Use

Using a drain unblocker is undoubtedly easier than tackling your blocked drain with a plunger, but some are easier to use than others. Look for a drain unblocker that gets to work quickly, requiring little effort on your part. Most can simply be poured down the drain and left for a period of time. This could be as little as 3 minutes, or as long as 12 hours!

Drain Unblocker FAQs

How does a drain unblocker work?

Drain unblockers work in 3 different ways. The first type of unblocker is a caustic drain unblocker. These produce heat which melts through the grease and grime. They can reach the blockage even through standing water.

Oxidising drain cleaners contain bleach and other chemicals. These dissolve the blockage, although they can damage certain types of pipework.

Finally, there’s acid drain cleaners which aren’t usually available to purchase for domestic use. These are commonly used by plumbers, and contain high concentrations of acid which can melt extremely stubborn blockages.

How to use drain unblocker?

Drain unblockers are generally used in a similar way, but you should still follow the manufacturer’s instructions very carefully to avoid damaging your pipework.

We recommend wearing safety goggles, rubber gloves and a face mask if needed. Open the bottle of drain cleaner and pour the specified amount into the drain. This could be just a few hundred millilitres, or the entire bottle! Leave to work for the recommended amount of time. This is around 30 minutes, but it may be overnight for more stubborn blockages.

Flush the sink through with plenty of hot water. Your sink should now be draining normally, if not, you may need to repeat the process.

Conclusion

A fast-acting drain unblocker can save you ample time when it comes to sink blockages. Plus, they can be used as preventatives, if you start to notice your water draining a little slower. For its ultra-strong formulation and ease of use, the Scotch Corporation Hair & Grease Remover for Drains is our top recommendation.

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