Steel wool on aluminum is a no no. If you use steel wool on aluminum two BAD things are likely to happen. Steel particles will be left from the steel wool on your aluminum rims. When the wheels get wet the particles will discolor and rust, staining your rims. Also, when the wheels get damp ( water is an electrolyte) you now have a
battery, particles of the least noble metal will be drawn to the more noble metal. Corrosion will occur in the form of pitting as the aluminum degrades and coats the
steel particles. This process will be accelerated in a salt air environment. Use of the 3M green scub pad is a better choice.