go with the rubbing alc and salt, soak it, fill it up, blocking the holes, and shake it up, the salt should work as an abrasive. Acetone also works wonders as does simple green
gs8778 Reviewed by gs8778 on . Bowl Cleaning wow im really stoned right now and i forgot how the fuck to clean my glass bowl....i think its with rubbing alcohol but i dunno im lost, someone please tell me quick on how to clean a glass pipe, the other better ways to clean it then just to scratch it out.... Rating: 5