Life happens. Use a microfibre cloth if you’ve gotten hair spray, or sunscreen, or whatever on your resin jewelry.
In order to maintain the clarity of the resin, please do not store it in direct sunlight for extended times. I haven’t had any issue with yellowing, but hey, let’s not tempt fate.
I would also recommend you take it off when showering, swimming, etc., because resin likes to stay dry if it can. If you’re caught in the rain, no big deal…unless it’s a monsoon or something, but if you’re caught in a megastorm you’ve got bigger issues to deal with.