It's waterproof. Confirmed on Disney site. Wet wipe will definitely not harm it.
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Already have a MagicBand+ or MagicBand from a previous visit? You can reuse your current MagicBand+ or MagicBand. Depending on how much time has passed, battery health may limit your ability to receive Disney PhotoPass attraction videos and select attraction photos with MagicBand.
Just make sure they're active. One thing thats a slight bummer is cannot use them to buy points at resort arcades but thats life. They will work for purchases and tapping into rides. But they won't link the ride photos that don't have a touch point.