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Environmental contamination exists but shouldn't affect stainless steel in that manner. Stainless can rust and does rust regardless of the environment. Certain cleaners, certain dust, and other things can cause what we're seeing. My suggestions would be less washing, plain water washing, less use of high pressure washing, no soaps or waxes, and most importantly drying thoroughly, the best is probably hand drying. Further, if stainless isn't properly bonded or insulated from other metals, it's probably going to rust faster and in places that you won't see at a glance. Lastly, if there's that much brake dust contamination in daily travel, then all of our lives are at risk, brakes in general aren't made out of the safest stuff.