If you're out and finding yourself with an oil slick on your face, head for the restroom and check for disposable toilet seat covers. These paper covers work exactly like an oil-absorbing blotting sheet. Just grab one, fold it a few times, and press it to the oily sections of your skin. Don't rub -- you'll wipe off cosmetics, irritate your skin, and possibly leave little pieces of paper behind on your face. Bonus: these paper covers work for sweat, too. Do the same dabbing method anywhere you're sweating.