I wish I was cuz I have a sweet Big Bong thats is caked on the inside and I can't get it off..

tried leaving in for a few days in Rubbing alchol and Salt and it helped but didn't clean it I need to scrape it I think But I cant get down in the bottom Its too big of a piece of glass.

Any ideas? the girl at the weed shop told me I had to use 99% proff rubbing Alchol I guiess I was using 70% i threw the bottle away so I don't know..

Can I boil it out? I have read about this but not sure if its a good idea for a large bong similar in size to delta 9s displayed Bong

kd