My bong is a smaller one. Not much taller than a soda can. I wash mine in plain soap&water with a bottle brush once a week. I also clean the stem with pipe cleaners and isoprophyl alcohol one a week. Again like Hilly said: Safety FIRST. Yours, then your piece.
wow i could tell h orror stories about using paint thinner! You gotta be careful becuase sometimes that taste doesnt come out!
Its really simple. if your bong is made of glass you put a 1 oz shot of 99% isopropyl and a table spoon of salt into the bong cover all the holes and shake it. then rinse it out. repeat if necessary