rotors turn brown when washed any way to stop it? (archive)

I brought a set of cross drilled rotors from Bavarian. They were nice and pretty when I put them on but that same night it rain and turn them rusty looking brown color. I took the wheels off and lightly sand the rust color off. now a week later I washed my chrome wheels and after it dryed the rotors were back to that ugly color. Is there any thing that can be done to stop them changing that way so fast. I mean all the money I spend for them you would thing this would not happen at all or at least not so fast. Right now my only soution is to take the wheels off the car to wash them so water wont hit the rotors and not to drive when its going to rain..)<:
Rock
94 525i
sharked

Follow Ups:

It'll come right off after 3-4 good stops... Tim Collins 11:18 7/30/2000 (0)

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