Placing a bottle upside down in the sink drain: a clever trick (Page 2 ) | July 16, 2025

A touch of washing-up liquid to dissolve grease
Then pour in some washing-up liquid. What for? Because it acts as a degreaser: it breaks down fats, makes them more fluid and limits their adhesion to the walls. It’s a bit like adding soap to a greasy pan: everything comes off more easily.

Hot water: the effective trigger

Continue with very hot water (about 1 litre, without boiling) – be careful not to burn yourself. This step liquefies fat deposits and activates the salt-dishwashing liquid duo. In addition, if your pipes are made of plastic, the heat expands them slightly, making it easier for water and residue to pass through. A real thermal boost.
The upside-down bottle: the simple but clever weapon

 

Here’s the key step: take an empty plastic water bottle, fill it with hot water and briefly plug the opening with your hand. Place it upside down on the sink drain (a cloth around it helps to caulk better), then squeeze it with a sharp blow. This gesture sends a localized surge of water into the pipe, a bit like a mini-cleaning wave. This targeted pressure can clear a light clog or restart a slow flow.
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