One of the many claims made on the back of the ballistol can is its ability to dissolve rust. Here are before and after photos of a rusted spanner head sprayed with a generous coat of ballistol and left for about an hour. The ballistol was then dried off using a paper towel. This product continues to give pleasing results and I think warrants use on many rusted tools where it may be tempting to apply a wire wheel (potentially disfiguring engraving you didn't realise was there in the first place).