ViChem VL-557 "De-Scaler" Burnishing Coumpound effectively removes heat treat discolorations or rust concurrent with outstanding burnishing action. Every consideration has been given to making this biodegradable formula as worker safe and enviromentally friendly as possible. Moderate foaming coupled with excellent lubricity protects parts from damage. VL-557 is a fantastic performer when used to clean & polish spent bullet casings. Mix 1-3oz per gallon of circulating fluid.