Then, pour in a little dish soap . Why? Because it acts as a degreaser: it breaks down grease, making it more fluid, and preventing it from sticking 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 liter, not boiling) —be careful not to burn yourself. This step helps dissolve grease buildup and activates the salt-dishwashing detergent combination. Furthermore, if the pipes are plastic, the heat expands them slightly, facilitating the passage of water and residue. A true thermal cure-all.
