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Also protect the battery packs, mine are in balloons as well. Also wrapped in electrical tape on the ends to protect from wear(tip picked up here)

You are supposed to clean them?? Seriously, cover the electronics, I have my receiver and servos in balloons, hose it down(cover the air filter), blow it dry with compressed air. Of course, if you have waterproof servos, you will be fine. Avoid soaking the bearings if possible.