Stay away from water unless you've water proofed your electronics! The only hope of saving your rx went away when you put power to it and something shorted and smoked.

You don't have to take one apart - just take it out and put it somewhere hot for a few days - I put my car in the sun with windows rolled up and set stuff on the dash. Rxs are so simple you can take one apart and dry it out or spray contact cleaner to remove moisture. I still put them in the car for a while to be sure - you only get one chance to dry it out.