Randy's black label cleaner is one of our very best sellers. Black label is the best glass cleaner on the market. This response is based solely on the results that black label cleaner produces after every single use. Black label is a lightning fast resin and goo cleaning solution for any metal, glass, or ceramic smoking utensil. Just apply black label to any piece, shake, and let it soak for a few minutes before rinsing out in warm water. In no time Randy's black label will have your piece looking good as new, and hitting like the day you pulled it off the shelf.