pHercules Sludge Treat Boiler Cleaner, 32 oz, Cap, Liquid, Light Brown, Hydrocarbon, 551 gl VOC, 1184 deg F Flash, Composition 55 to 75 Solvent Naphtha PetroleumMedium Aliph, 5 to 15 2Butoxyethanol, 1 to 5 Distillate PetroleumHydrotreated Heavy Naphthenic, 1 to 5 Solvent Naphtha PetroleumLight Aromatic, 08 Specific Gravity, DomesticppHercules Sludge Treat storage tank additive cleans and conditions heating system fuel oil to prevent fuelrelated failures, improve combustion efficiency, reduce soot formation and conserve energyp