Inspired by a helpful YouTube guide. This walk-through draws on the practical video "How to Unblock a Bath or Shower" from Dyno, one of the UK's best-known plumbing and drainage services. They cover the common causes clearly and walk through the tools that actually work — worth a watch before you start pulling things apart.
1. Remove and clean the hair strainer
Most baths have a crossbar or dome strainer over the waste outlet. Unscrew it or pop it out and take a look. It's almost certainly covered in a greyish mat of hair, soap, and limescale. Not glamorous.
Clean it thoroughly under the tap with an old toothbrush. While it's out, shine a torch into the waste opening and scrape out any build-up just below the surface with a bent wire or a long-handled bottle brush. This one step clears a surprising number of slow drains on its own.
2. Try running very hot water first
Before reaching for anything else, fill the kettle and pour boiling water slowly down the drain — or as hot as your pipes can handle (avoid boiling water on plastic waste pipes; use very hot tap water instead). Hot water softens soap residue and grease that may be partially blocking the pipe.
Follow it with a good blast of hot water from the tap. If the drain speeds up noticeably, repeat and you may have solved it. If there's no change, move to the next step.
3. Use a plunger
A cup plunger works well on bath drains. Block the overflow opening — usually a chrome plate near the top of the bath — with a damp cloth or your hand to stop air escaping. Place the plunger cup directly over the drain and press down to seal it.
Plunge vigorously up and down about ten times, then pull away sharply. Repeat three or four times and flush with hot water. The suction action dislodges blockages sitting in the trap or the first section of pipe.
4. Use a chemical drain unblocker
Products like Mr Muscle Drain Unblocker or HG Drain Unblocker work by dissolving organic material — hair and soap compounds — in the pipe. Follow the label instructions carefully: most need to be left to work for at least thirty minutes or overnight.
Wear gloves and keep the room ventilated. Don't mix different products and don't use chemicals immediately after a plunger session — you risk splashing caustic liquid. Give the drain a good flush with cold water afterwards to wash the product through completely.
5. Try a drain snake or flexible rod
A simple flexible drain snake — the coiled wire type — can reach around the trap and into the pipe to pull out or break up blockages that chemicals haven't shifted. Feed it in gently, rotate as you go, and pull back any material you hook.
Mind you, if the blockage is solid and deep, a proper drain auger (a longer, motorised version) will do a much better job than a hand snake. These can be hired from most tool hire shops for around £20 a day.
6. Check the waste trap under the bath
If the bath has an accessible panel, remove it and locate the P-trap or bottle trap beneath the waste outlet. Put a bucket under the trap, unscrew the lower section by hand or with pliers, and empty any debris directly into the bucket.
A fully blocked trap will be full of black sludge and hair — clearing it out usually restores drainage immediately. Refit the trap, making sure the sealing washer is seated correctly, and run water to check for leaks at the joint.
7. Prevent future blockages
A fine mesh drain screen is by far the easiest prevention — it catches hair before it enters the pipe and costs about £3 from any DIY or pound shop. Clean it after every bath or shower.
Pour a kettle of hot water down the drain once a week to keep soap build-up from accumulating. A monthly treatment with a bicarbonate of soda and white vinegar flush (leave for 30 minutes, then flush with hot water) is a good habit and kinder to pipes than caustic chemicals.
When to call a handyman
If the blockage keeps coming back, affects multiple outlets at once, or seems to be deeper in the main soil stack, it's time to call in a drainage specialist. Richard can also help with replacing a worn bath waste, fitting a new trap, or any other bathroom plumbing repair that's beyond a simple unblocking job.
Need bathroom plumbing help?
The Sandwich Handyman can handle waste repairs, trap replacements, bath resealing, and general bathroom plumbing jobs in Sandwich and the surrounding area.
Contact Richard