Step 1: Towels
Place some towels around the toilet, just in case!
Step 2: Dish liquid
Pour about a cup of dish liquid into the toilet. Then pour a bucket (or as much water as will fit into the toilet) of warm water into the toilet bowl. Let it sit for around 20 minutes.
Step 3: Pour in more warm water
Now the water should have sunk back down to a nearly normal level in the toilet. Pour one more bucket of warm water into the toilet. This increases the water cycle and pushes blockages further down the pipes and out.
Hopefully, this will help and if not, you may want to think about contacting a professional plumber.
You can see the tips step-by-step in the clip below:
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