I've gotten to the point where I needed to stop acquiring coins and start worrying about better storage of my collection at home. I have purchased 2x2 cardboard/mylar window flips for most of my US circulated coinage (including "junk silver" coins) as well as 2x2 Quadrum capsules for silver bullion type coins. My question is: Do I need to do something to these coins prior to putting them into the flips/capsules? Like wiping them off with a cotton cloth first to remove any surface dirt/dust. Or should I go as far as an acetone bath? What do you do to your coins before putting them in flips/capsules? Thanks for any insight, tips, ideas.