Clean your pipes and hookahs 100% Naturally! Get Your Clean On with Green Glass Clean! Green Glass Clean is an all natural bio-degradable environmentally safe cleaner specifically engineered to clean the grungiest, caked-on, resin-clogged glass water pipes, glass pipes and hookahs. All ingredients are safe and non-toxic. It is safe to use on glass, plastic, ceramic, wood and about anything you can smoke from. 16 oz. bottle.