I know one guy who made a recvr waterproof~ he hooked everything up and encased it in beeswax in the box they come it. Worked great! the reason he did this, he only has saltwater to run in, so that is like death overnight even after a good washing, the salt is fierce on electronics.
To remove it you use a hair dryer
slick idea for extreme cases.
I use corrosionX on it, I take it apart and apply it with a toothbrush to everything real good and then go to great lengths to make a water tight radio box. drop in a couple cotton torpedos (with lanyard) and a extra super maxi pad and it's good to go! Pack it in cotton I always say!