Best Drain Unblockers For Sale In The UK

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Occasionally our drains and sewage systems will be blocked by fat or waste. Normally, the water slowly drains or no longer runs, and sooner or later, we’re all faced with blocked drains, and we need the right products to unblock them. So, what is the strongest drain cleaner on the market? In this comparison article, we’ve researched the market and come up with some of the best sink unblockers. From extra strength drain cleaners to super strength drain cleaners, you’ll be able to choose which product suits your needs best, whether it be the best outdoor drain unblocker, a toilet pipe unblocker, or the best liquid sink unblocker – let’s begin!

What is the best drain unblocker?

Are you constantly tired of unblocking your bathroom drains? Are you having issues with your kitchen drains and looking for the best drain cleaner for fat? Have you tried and failed at the baking soda and vinegar tricks to clear a blockage? Read on to discover what are the best products for drain unblocking that are available for UK householders to buy online today.

A partially blocked drain can often be cleared by yourself, without calling anyone out.  Periodically cleaning with an industrial powerful drain unblocker like one of the following products can prevent drains from becoming blocked in the first place, or make it quicker for you to deal with if they do.  Drain cleaning products have to be powerful, and the chemical products listed below are hazardous, so be sure to read the label/Safety Data Sheets and follow safe practices.

If your drains are repeatedly blocking, speak to us today as there are multiple ways we can help.  We at MZR Drainage not only clear blocked drains, but we can also use cameras (with a CCTV drainage survey) to find the root cause and rectify the problem to prevent the inconvenience and cost of reoccurrence.

Here are the best drain unblockers for sale online in the UK based on our research:

Pro-Kleen Sink and Drain Super Strength Formula

The team over at Pro-Kleen claims that their Sink and Drain Blitz!’s Super Strength Formula is up to 20 times stronger than any standard drainage cleaner. We don’t know what they class as a ‘standard’, but we can certainly say it does a great job at dissolving common plughole and toilet-blocking gunk and debris.

Sink and Drain Blitz! left overnight fully dissolves oils, grease and hair build-up inside sink and shower traps. You can use it in toilets, bathroom sinks and clogged drains, either when you notice the water isn’t draining so quickly or giving bad odours, or as a monthly preventative routine.  It is suitable for almost all plumbing, from plastic pipes and PVC to metal and copper.  It is however important to read the label, observe the safety information, and not spill or splash it onto surrounding surfaces as it is very powerful.

Pro-Kleen recommends that 250ml of their solution should be an ample amount to unblock your drainage and plumbing. You should then leave it for a minimum of one to three hours, but preferably overnight if you can. Rinse the drain with plenty of hot water afterward.

The product leaves mixed impressions when it comes to efficiency. On one hand, if you use the required 250ml per treatment, you get 12 treatments out of the box, giving you the best value for money. On the other hand, some of the toughest blocks can require over 250ml, so the cost-effectiveness of the solution is more difficult to measure.

If your blockage is severe, keeps reoccurring, or you don’t fancy doing it DIY, this drain unblocker service clears them all!

According to Amazon, Pro-Kleen’s Sink and Drain Blitz! is rated 4 out of 5 stars from over 500 reviews.

MZR Commercial & Domestic Drainage Services Birmingham
MZR Commercial & Domestic Drainage Services Birmingham

HG Drain and Plug Unblocker

Drain and Plug Unblocker is the new name for HG’s Classic Liquid Drain Unblocker.   This classic proven drain-unblocking product has over 17,000 reviews (globally) averaging 4.3/5 stars on Amazon, no wonder it’s singled out on the platform as their recommended choice for “toilet unblocked”.  It’s a well-known and proven product that’s widely available from stores throughout the UK from supermarkets to DIY stores and it’s made its way onto this shortlist because of that.

You just have to pour 300ml down the drain for a regular block, which usually takes about 30 minutes to work. You can then rinse it clear with either hot or cold water. As far as slow-draining pipes are concerned, it is better to apply the same amount of solution to warm water, let it sit overnight and rinse with warm water the next day.

The product has some benefits over its subpar competitors. In terms of practicality, you don’t need to dilute the product, decreasing the chances of splashback and skin contact. We would warn you not to use this product on kitchen sinks as it is not suitable for aluminium or zinc.

Mr. Muscle Max Gel Unblocker

The Mr. Muscle brand has been advertised as the ultimate gel unblocker and it doesn’t play around. It claims to take as little as 5 minutes to work on hair and soap, is safe for all pipe materials and sinks through standing water to get to work right on the blockage.

This is a very fast-acting product, usually just taking one shot to clear a blockage. With other standard drain cleaners, you usually have to wait for hours or leave it overnight for them to work properly.

With Mr. Muscle, all you have to do is add the solution, wait five minutes, and run hot water down the drain. When required, you can repeat, but this is rarely necessary because it usually removes the blockage from drainage pipes fairly rapidly the first time around.

This fast-acting unblocker will dissolve any blockage and any unpleasant odours will be eliminated. A quick-acting unblocker eliminates grunge and hair in a single dose and quickly clears the worst blockages.

A powerful drain unblocker, this drain cleaner can be used with sinks, kitchens, and toilets making it ideal for use throughout the house. Whether this Mr. Muscle Gel is used on rubber, PVC, metal, or a sewage pipe, it doesn’t matter.

Mr. Muscle Max Gel Unblocker is one of the best heavy-duty drain unblockers on the market today, it is rated 4 out of 5 stars from over 750 Amazon reviews – and it’s  MZR approved as an excellent drain cleaner!

MZR Commercial & Domestic Drainage Services Birmingham
MZR Commercial & Domestic Drainage Services Birmingham

Scotch Corporation Heavy Duty Liquid Drainer

This is best described as a cost-effective treatment for all blockages on household drains by the Scotch Corporation.

Place two cups into the drain steadily, allow it to sit for an hour or two, and then rinse it with hot water. Although you may not have to, for serious blockages, it is best if you leave the solution to sit overnight. That said, if the blockage is closer to the bottom of the drain, it can take longer than one night to remove the obstacle.

The formula is the best part of this product. The non-acid formula guarantees all piping and drainage is safe, but we advise not to use this solution on waste disposal drainage because the non-stainless steel can become damaged. We also recommend not using this product on toilets either, because it can potentially lead to it overflowing, causing safety issues.

All in all, with its mid-range price, powerful caustic formula, and convenient packaging, this heavy-duty drainage cleaner from Scotch Corporation makes an enticing case.

According to Amazon, this heavy-duty drain unblocker is rated 4 out of 5 stars from over 1,350 reviews;- ease of use is often cited as its best advantage.

Strongest Drain Unblocker

The strongest drain unblocker liquid available in the UK is called OneShot which is produced in Humberside and is over 90% proof sulphuric acid that quickly goes to the organic matter blocking the drains or gulley and eats through it.

This industrial drain cleaner is however a professional product. You will have to be a company to buy it from most plumber’s merchants, if you are wondering what’s the strongest drain unblocker then this is it, but it would generally be wiser to use a qualified drain unblocking company like MZR.

Of course, prevention is better than cure!  Hopefully, the above has helped you get that nasty blockage cleared – avoid a reoccurrence by following our recommendations for the best drain maintenance.

MZR Commercial & Domestic Drainage Services Birmingham

How Can MZR Drainage Services Help You?

Are these products not moving the gunk and grime? Would you rather a professional sort it for you? Here at MZR Drainage, we offer professional drain cleaning and an expert drainage unblocking service that is second to none. We have 35 years of experience in drain unblocking services, as well as being proud members of since 2015 – check out our 250+ reviews. 

We also operate a 24/7 emergency service within the Birmingham, Walsall, Warwick, and Coventry areas. We are normally able to get our experienced team out to you within the hour and give you honest and transparent quotes – no surprise fees further down the line! 

If you need any help or need more information regarding our services, please feel free to contact us on our office number by calling 0121 663 1060 or 07967835427. You can also get in touch with us for more information by emailing

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