How to Unblock a Toilet (UK DIY Guide)
A blocked toilet can quickly become a stressful and messy problem. In many cases, blockages are caused by excess toilet paper or non-flushable items and can be cleared without calling a plumber.
This step-by-step UK DIY guide explains how to unblock a toilet safely and when professional help is needed.
Tools You’ll Need
- Rubber toilet plunger (flange type preferred)
- Rubber gloves
- Bucket
- Old towels or newspaper
- Toilet auger (optional)
Materials Required
- Washing-up liquid
- Warm (not boiling) water
- Baking soda and vinegar (optional)
Step 1: Avoid Flushing Again
If the water level is high, do not flush.
Flushing again may cause overflow.
Wait a few minutes to see if the water level drops naturally.
Step 2: Add Washing-Up Liquid
Pour a generous amount of washing-up liquid into the bowl.
Let it sit for 10–15 minutes.
This helps lubricate and break down the blockage.
Add warm (not boiling) water to help soften the obstruction.
Step 3: Use a Plunger
Place the plunger firmly over the drain opening.
Push down gently at first to release trapped air.
Pump vigorously for 20–30 seconds.
Check if the water begins to drain.
Repeat if necessary.
Step 4: Use a Toilet Auger (If Needed)
Insert the toilet auger into the bowl.
Turn the handle slowly to break up or hook the blockage.
Pull back carefully.
Flush once to test (only if water level is normal).
Step 5: Baking Soda and Vinegar (Optional)
Pour one cup of baking soda into the toilet.
Add one cup of vinegar.
Leave for 30 minutes.
Flush with warm water.
This may help with minor organic blockages.
Common Mistakes to Avoid
- Using boiling water (can crack porcelain)
- Using chemical drain cleaners excessively
- Forcing objects down the drain
- Flushing wipes or sanitary products
- Ignoring repeated blockages
Recurring blockages may indicate a deeper drain issue.
When to Call a Professional
You should contact a professional if:
- The toilet keeps blocking repeatedly
- Multiple drains are backing up
- There is a sewage smell
- Water is overflowing onto the floor
- Outdoor drains are also blocked
See our Blocked Drain Repair Cost Guide for typical UK pricing.