ditto on both. I wiped both of my humidors down once with distilled water, put the sponge w/distilled water on a plastic bag in the humi, closed it and then let it sit for 3 days. Charged the credo with PG, it hit 70, waited for one more day, still held at 70 and then I knew it was good to go. If you have gars in it, take them out and put them in a cooler/tupper/sweaterdor. Leave the lid open and air that puppy out. Did you calibrate the hygrometer w/ the salt test? I've found it to be a more accurate test than the damp washcloth