Handi-Cleaner Expandable Foam Gun Cleaner is designed to be used for the cleaning of Expandable Foam Applicator Guns. How to use: Attach Handi-Cleaner Expandable Foam Gun Cleaner to Expandable Foam Applicator Gun and discharge onto a safe throw-away surface such as a rag or piece of cardboard. When to use: Cleaner must be used almost immediately after expandable foam gun use. If expandable foam is allowed to harden in applicator gun, it is nearly impossible to remove and will need to be done mechanically. Dissolves uncured foam and adhesives Cleans foam applicator tools 12 ounce multi-use can