Why does my bathroom sink overflow smell? If the sink begins to smell once the water hits the overflow drain, the stagnant water is the issue. This can be resolved by pouring a liquid clog cleaner down the drain. Does your drain smell like rotten eggs? This could be due to sewer gases being trapped by water.
How do I clean the hole in the back of my bathroom sink?
What is the hole in the bathroom sink for? They serve two functions: to prevent an overflow with the drain stopper engaged and to provide an escape route for air in the drain. Without this hole, a full basin of water would drain slowly because of the resistance it puts on air escaping up from the drain.
How do you clear a clogged overflow pipe? If you’ve got a completely blocked waste pipe, fill your sink up part way and place the cup of a sink plunger over the plug-hole. Follow that by stuffing a damp cloth into the overflow to prevent any pressure loss. Pump the plunger up and down vigorously – go on, give it some welly!