MEECO'S RED DEVIL liquid soot remover is a special blend of chemical compounds carefully formulated to attack existing soot formations and help prevent further buildup. This is not a stand-alone cleaning product, it is a fuel additive that combats the formation of sludge and gum deposits in fuel tanks, lines, and filters. Safe for use in oil-burning furnaces, diesel-fired pressure washers, steam cleaners and engine. Soot buildup can cause oils to thicken, which can reduce burner efficiency in engines.