At least once a week, soak your brushes and sponges in a warm tub of water. You can use a chemical-free solution or a special brush and sponge product that is readily available today. Use a scrub pad to clean them and make sure to focus on the grooves and edges too. You should wash them with plenty of lukewarm water and lay them out. Drying them outside is dangerous as dust might get attracted to the moisture and settle in them. The best choice is to do it in a closed room, allowing them to dry naturally. Store them in a clean case or pouch, ready for your next use.