Keeping your face mask clean is almost as important as wearing one. The experts weigh in with tips: washing properly between wearings keeps your mask from becoming contaminated. Add to your washer with regular laundry, wash in hot water and dry. Using a mesh lingerie bag helps keep ear loops from tangling. Remember that the outside surface of any mask can become contaminated after one exposure to the Covid virus. Treat every unwashed mask as potentially dangerous until its properly washed and dries