I periodically inspect, replenish or upgrade my PSK ( o.k. I play with it watching SURVIVOR.) Fingerprints can be very salt laden ( why gunshops are forever wiping down firearms with silicone cloths) and moisture is almost everywhere. I make it a habit of wiping my gear and have began collecting those little dessicant packets or cylinders for potential use. I just use the small vial Barry stocks and periodically dump my perishables early like older batteries.