Every car/truck I have is water proof. Put all the servos and electronics in balloons. I have a plug that I keep on the stinger to keep anything from leaking out, I just stick that on then put a balloon over the intake. Soak it down with a good cleaner then hit it with a brush and a rag and rise. Then touch up with wd-40. Never had a problem with messed up servos doing it that way.