PRESTA, 1 Gallon, Heavy Duty Cleaner, Conquest PST-131101 The PRESTA PST-131101 Conquest Heavy Duty Cleaner is a powerful, biodegradable, non-caustic concentrate designed to clean a variety of automotive surfaces. This 1-gallon cleaner/degreaser can be diluted for various applications, including engines, door jambs, and more, without harming painted surfaces or etching aluminum. It effectively removes heavy dirt, grease, silicone, and wax, leaving no film or residue.