Most of us treat that dark cabinet beneath the kitchen or bathroom sink like a spare room nobody checks. Cleaning bottles ...
Pour a 1/2 cup of baking soda and a 1/2 cup of white vinegar into the drain and allow it to bubble for about 20 minutes.
Tired of wasting water while you're waiting for it to get hot? Put an end to that problem by installing a tank-style or tankless under-sink water heater.