Formula 420 is specially designed for cleaning your pyrex, glass, metal, and ceramic smoking accessories. This non-toxic and biodegradable formula cleans and removes odor within seconds! Never stress about unwanted odor or staining- this special cleaning formula is super easy to use. Simply soak your desired accessory in the proper amounts of formula and water, soak for one minute, and rinse! Its never been easier for you (or your butler) to keep your smoking accessories clean! Worried about smells in the air? The Butler highly recommends Formula 420 Smog Out to keep things pleasant and inconspicuous.