I'd spray a little Corrosion - X into rx and let set for 1 hour and then use a hair dryer and blow most of it out. Then lay rx on a paper towel in sunlight for few hours. When you remove the red wire and tape it back; you need a rx with a 6 volt power like 4 AA. Lipos should be dried before charging or blown out with AIR to remove any moisture. Each person has their own method to remove h2o out of packs. Also the esc may have a couple of drops of water in it as no esc is water proof. They say splash proof which means it isn't water. Now if you do need a new esc, take off the shrink and spray X all over the esc and blow dry with dryer and let dry for a day in window sill and let the sun do its job and replace with new shrink. If lipo bulges, take it outside and let lay for day in the sun. I did this with a pack and it returned to normal size but kept a close eye on pack. These are suggestion and not in concrete. LOL!