How to Unblock a Toilet: A Step-by-Step Guide

A blocked toilet is one of those problems that always seems to happen at the worst possible time. The good news is that most blockages can be cleared at home with a few simple tools. This guide walks you through how to unblock a toilet step by step, and when it’s time to call a plumber.

Before you start

If the bowl is full or the water is rising, don’t keep flushing — it will only overflow. Wait for the water level to drop, put on rubber gloves, and lay down old towels or newspaper to protect the floor. Have a bucket handy.

Method 1: Use a plunger (the reliable first choice)

A flanged toilet plunger (the type with an extra rubber flap) works best.

Make sure there’s enough water in the bowl to cover the plunger head — add some from a jug if needed.
Place the plunger over the outlet and press down gently first to push out trapped air.
Now plunge firmly up and down for 15–20 seconds, keeping the seal intact.
Pull away sharply on the last push. If the water drains, the blockage has cleared. Repeat if needed.

Method 2: Hot water and washing-up liquid

For a minor blockage, squirt a generous amount of washing-up liquid into the bowl and leave it for 10 minutes. Then pour in a bucket of hot (not boiling) water from waist height. The soap acts as a lubricant and the water can help push a soft blockage through. Never use boiling water, as it can crack the ceramic.

Method 3: Baking soda and white vinegar

A natural alternative to harsh chemicals: pour one cup of baking soda into the bowl, followed by two cups of white vinegar. Leave the fizzing mixture to work for around 30 minutes, then flush. This is gentle on your pipes and often enough for organic blockages.

Method 4: A toilet auger for stubborn blockages

If plunging fails, a toilet auger (or “closet snake”) can reach further into the trap. Feed the cable in gently, turning the handle to break up or hook the blockage, then withdraw it slowly. Take care not to scratch the bowl.

What not to do

Avoid harsh chemical drain cleaners. They can damage older pipes and are ineffective on solid blockages like wipes.
Don’t keep flushing a blocked toilet in the hope it clears — you risk an overflow.
Never flush wipes, sanitary products or cotton buds — they are the most common cause of blockages, even when labelled “flushable”.

When to call a plumber

Call a professional if the blockage won’t clear, if it keeps coming back, or if water backs up into other drains, sinks or the shower when you flush. Several fixtures backing up at once usually points to a blockage in the main drain rather than the toilet itself, which needs professional drainage equipment to clear safely. A persistent sewage smell is another sign to get it checked.

If the toilet flushes weakly rather than being blocked, the issue may be low water pressure instead.

Frequently asked questions

Can I unblock a toilet without a plunger?

Yes. Washing-up liquid with hot water, or baking soda and vinegar, will often clear a minor blockage. For anything stubborn, a plunger or auger is more effective.

Why does my toilet keep getting blocked?

Recurring blockages usually mean flushing unsuitable items (wipes, sanitary products), a partial blockage further down the pipe, or an underlying drainage fault that needs a professional inspection.

Is it an emergency if my toilet is blocked?

If it’s your only toilet, or waste is backing up into other fixtures, it’s worth calling a plumber promptly to avoid overflow and hygiene issues.

Need a plumber in West London?

If you’ve tried the steps above and the toilet is still blocked, we can help. Our team provides fast, reliable drainage and blocked-toilet services and general plumbing across West London, with no call-out surprises and honest, up-front pricing.

Tel: 020 3561 4415