I'm not a professional but when I was buying my pad from
meguiars they said to just let them dry and then pat them off before you use them the next time. The only thing you have to watch out for is to mark the pads so you use the same kind of product the next time... polish pad use only for polishing all the time... cleaner use ,,, and so on... I found using a permanent marker when the pads are new or dry will work on clearly marking the pads so you know what product you used on it prior.