There's good reason: "When doing your makeup, your fingers are covered in creams and oils, and that residue winds up on your compacts," says makeup artist Kate Lee for Chanel. What's worse? You can transfer that residue and bacteria to your face. So keep antibacterial wipes nearby and take a minute to rub down the surfaces. Don't forget to disinfect makeup and beauty tools as well: Wash eye shadow applicators by hand with dish detergent and water, and regularly wipe down lipstick bullets and gloss brushes, says Fiona Stiles.