MARS TAB™, condensate and drip pan clean-out tablets, prevent plugging of air conditioning condensate drip pans and drain lines. MARS TAB™ does not release any chlorine or other noxious fumes. This economical, simple positive protection can be used on steel, copper, galvanized, painted surfaces and other materials without damage. It is one of the few treatments that will not stain exterior wall when line drains outside.