Cleaning steel or iron parts can expose the bare metal and cause flash rusting of the parts. Adding a rust inhibitor will delay the rust process and allow time for treating the parts if necessary. Using a rust inhibitor in washers can extend the life of the machine and reduce rust build-up on the equipment. Mixing Ratio: 1%‐2% for 7‐Day Rust Protection or 3%‐5% for 30-Day Rust Protection