I make it a point to spray down the calipers etc at every car wash. Self serve car wash w/pressure and in the winter and just fresh water when doing it in the driveway in good weather. The openings between the wheel spokes makes it a lot easier than my last car. On that car the rotors looked similar to Conrad 16.5's. Lack of contact and actually milky white spots on the inside surface and poor braking. Lots of short hops (2 miles to work) and salted or brine on roads before the first potential snowflake hit the ground. They don't have to pay for corrosion damage.
While on the subject of corrosion, I learned the hard way (hundreds of dollars chasing and finally finding and fixing an A/C leak on that car) to spray down the radiator and A/C condenser and all around it at every car wash. The bottom corner of the aluminum condenser corroded from dirt and salt accumulation and took 3 attempts with UV dye to finally find.At every car wash the CX-5 gets the wand thru the grill and the opening below and sprayed down real good. The engine and firewall and fenders also get sprayed down occasionally. In a climate where the roads are salted, you have to be vigilant in cleaning areas that act like a shelf for salt to accumulate.
Detergent and fresh water are your friends.