I just found the most epic glass cleaner a month or two ago. It's called New-Glass Resin Cleaner. I've been keeping my pieces clean for 13 years and tried everything. I love my bong but the perculator is such a pain in the ass to clean. This shit is seriously crazy how good it works especially with the downstem and perc. I got mine on Amazon & the website's www.newglasscleaner.com
Nice, all it really is though is Kosher salt and ISO alcohol. They are just scented I think. I have tried Formula 420 and Orange Chronic cleaner.
No their product description said it has Acetone. Not rubbing alcohol. salt and alcohol take forever, this stuff is crazy fast.