This was my first winter with the RS3 and holy sweet adorable God, the iron spots on my paint. After my first good wash at the end of winter I got the old Iron-X into action and this stuff really works great. There were a few residual spots left after use but nothing that couldn't be easily removed. The Iron-X smells absolutely terrible so make sure you use it downwind, wear gloves and watch for overspray or just wash your entire can again after you use it. This is the definitely a great product to use on your white paint to remove those "rusty" spots.