This unique cleaning recipe for all forms of glassware comes from world-famous American glass company Sheldon Black. Soft enough to clean your most precious pieces, but hard enough to purify your everyday drivers (whether used for dry herbs or concentrates). This is easy to use; reusable does not have to be scrubbed, does not have toxic abrasives, and is free of alcohol. Just pour into your dirty tubing, water tubing, concentrates, etc., and allow it to soak until it's fully clean. The exclusive formula clears all residues, including the oils, during the waiting process, in the optimal time to obtain sparkling, clean results. It doesn't worry because it's biodegradable and environmentally friendly. Built-in the USA. Made in America.