Most often the question is asked how to clean a glass pipe. There are many ways to clean pipe, but we found the easiest way is to use the formula 420 glass cleaner. After many years of using this glass cleaner we know that it always gets the job done. Over and over again it has proved to be the quickest and safest way to clean a glass pipes without breaking or damaging them. This product is one we recommend for all kinds of pipes and accessories that can be made of glass, pyrex, metal or acrylic.