Sometime when your rents aren't home go and smoke in the shower and see how yourself how it clears out and how to cover it up. I think testing it is the best cause I found I cant smoke alot of bowls when jsut in the shower. If your room while smoking in it doesn't clear for over an hour then you must be doing something wrong. Make sure the smoke goes out the window and doesnt blow back in. Also put a fan in the room after and spray something and even in the smallest rooms(mine) any smell will disapear in around 20 minutes.

-peace