The drains on our master bathroom look like they drain properly, but there's at least a hint that something's wrong: whenever we use mouthwash, the smell of mint sticks in the master bathroom and invades the master bedroom for many minutes afterwards.
The bathroom also often acquires a vaguely damp smell (though there is no fan, and we live in a humid area, so it may simply be damp).
Is there anything we should consider doing before putting money into having a plumber come out and looking at the drains? (We've tried a couple of obvious simple things like baking soda and vinegar down the drains, and Liquid Plumr/Drano.)
Best Answer
I agree with @isherwood+ The P trap holds some water to prevent sewer gasses from entering the home (all drains have them some times called a U bend). After rinsing your mouth, run the water for a bit to flush the mouthwash down the drain and the smell will be gone.