You probably don't have a bottle of WD-40 hanging out in ... On a sunny day, spray a generous spritz of WD-40 to the rust stain and thoroughly blot it (a paper towel works well).
Inside are the transparent EZ-Pods. Recommended use is to dissolve them in a spray bottle of plain tap water (warm is best). The company's own WD-40 Spray Applicator is available, but any similar ...
The added benefit of WD-40 over traditional cleaning liquids is that its oil-based nature means that it can also give your lights a new shiny finish that makes them appear good as new. This is because ...