In our area and St. Louis we have a small grocery chain (don't laugh), Schnuck's. It's a rare delight as far as grocery shopping goes. Beats the heck out of the dreadful WalMart.
Anyhow - where was I? - Schnucks has a free dispenser of moist anti-bacteria towels near the exit doors. They suggest you wipe your hands, the cart handle and so on. Isn't that amazing?