Randy's Black Label 350mL When a brand as well known in the industry as Randy's puts their name to a bong cleaning product you pay attention. And you won't be sorry that you did. It does what it promises to do. Excellent for use on glass metal & ceramics. Featuring granulated particles to loosen the grime and get into the intricate bits your brushes can't reach this alcohol based cleaner will take your bong from gunky to gleaming in just a minute or two. Pour it in plug it up shake it around tip it out and rinse. Done. Minimal effort No scrubbing.