dude make sure you get some salt and put it in the bong with the acetone. the acetone will dissolve some stuff and loosen the grime, but the salt is very abrasive and ud be surprised, salt cleans my tree perc so well in my bong
sorry, not trying to be a dick but glass adsorbs most things that are water soluble (i.e. silica gel, same chemical [SiO2] as glass): Adsorption - Wikipedia, the free encyclopedia then once you refill it with water........
"This process creates a film of the adsorbate on the surface of the adsorbent. This process differs from absorption, in which a fluid (the absorbate) permeates or is dissolved by a liquid or solid (the absorbent)." whatever..im out.