Well, for the dash, I would tape EVERYTHING off, sand (roughen) it up and paint it.

The switch you should be able to remove from the console and clean in an ultrasonic cleaner (for jewelry) for 10 minutes in a mild detergent solution and get good results. Dry with compressed air and let sit overnight in that famous dry heat. You should be able to find one in Dubai.

At least that is what I would do...