No steel wool! And no acid (coke, vinegar) either. It always leaves residue somewhere and the steel wool leaves micro scratches, which starts rusting right away. Serious, don't. Acid creeps between the spoke nipples and the rim, and slowly turns -the insides of course- of your aluminum rims into cauliflowers, and seizes the nipples to the spokes.
You rather wipe and rub it with ACF-50. It removes existing rust, and protects against new rust, and it doesn't scratch the spokes. Remember, scratches rust quicker than a smooth surface.