I just did a search here for isopropyl because I have previously used it to clean pipes and it works well. I also had the same question. I know that when I was in the Air Force we used Isopropyl alcohol because it would evaporate without leaving residue.

My glass pipe for whatever reason has a very small rush hole. Usually I get most of my resin out of the rush hole opening (in other words down inside the glass bowl) but it's too small to let anything fit out.

I want to soak it in isopropyl because I was thinking that it would evaporate but I'm no expert on the subject either. Anyone else have any ideas?