I just starting using a new glass pipe cleaner called Pur Sterile and it works
great. None of that nasty smell or taste you get with rubbing alcohol or Formula 420. I know you can get it in most head shops in California, but they also have a website

PUR STERILE - Cleaning Glass Pipe -- Pipe Bongs -- Hand Blown Glass Pipes -- Custom Glass Pipes -- Glass Pipe Cleaner.

where you can pick some up. Its super cheap and
easy. I think it was like $5 for 2 cleanings!

Hope it helps!