Zep Commercial liquid heat drain unblocked has a heavy-duty formulation reacts with the water and blockage enabling it to melt away grease, fat food build ups effortlesslyThis professional-strength formula is safe for Plastic pimples. Destroys grease, fat food build-up effortlessly. this professional-strength formula is safe for Plastic pimples. food build-up effortlessly. destroys grease, fat . Heavy duty formulations melts tough blockages.