Gabchems Radiator Cleaner is suitable for long-term radiator usage and it is great for annual maintenance. It does not contain acid, it does not damage rubber and aluminum parts. Removes oil, lime, rust, sludge and sediment from the cooling system. Removes dirt that occurs after engine repairs. Cleans the oil residues caused by the lid failure. Prevents rusting. Prevents overheating after care. Sufficient for 2-6 liter liquid tank radiators.