[Perfectlap]

Well you could try to dry the rotors after you wash them to lessen the rust effect.

I'm going to assume you don't have mesh wheels, which is its own ordeal.
If they are spoked painted alloys, have you tried waxing your wheels?

I don't mess with the wash mitt on wheels, too messy. Instead, I have two brushes, a Meguiar's Gold Class wheel face brush for the outside of the wheel, and their spoke brush for the inside barrel. Its not my fave part of the cleaning but I can do each wheel in minutes and its a 1000% improvement.

Another thing I do is fill a bucket with water and add a couple of ounces of Optimum No Rinse. I wiped down the paint first (in the direction of the wind) and then I use the left over water to clean the wheels with the brushes. After drying with the waffle weave, I spray down paint, dash, glass and wheels with FK1 425, its like teflon and cuts down on cleaning.