This is a must for pot heads using glass pipes! Formula 420 is the first of its kind! Perfect way to clean your hookahs/water pipes from the gunk and residue that collects over time. Rated #1 by consumers! No scrubbing, no waiting. Just pour it in, swirl, wait 1 minute and its ready. Features Exclusive Patented Abrasiv Action Technology and is the official cleaner for top of the line glass blowers. No after taste or smell, Easy to use, Earth friendly, Rinses easily and brightens glass. Only for glass and metal products.