I have a nice glass piece with 3 tree percs. I have had it now for about 3 months and the 3 percolated chambers are starting to get a brownish hue on the class. I wash it out every time I use it and every few times I cleaned it with 420 solution. The 420 helped make it taste better, but the only thing I've found so far to clean it somewhat is pouring boiling water in it and shaking it hard for a couple minutes.
The bottom chamber cleans real well but the 2 top percolators just keep getting dirtier and dirtier. Since I invested so much in this piece, I really wanna keep it looking good for myself and when it's smoked at parties. Does anyone have some other methods of cleaning that is more intense than the 420 or boiling water? Does anyone else have experience cleaning the multi chambered bongs and did it get dirty on you?