Our magnets can be cleaned with regular soap and water. Make sure that they are stored flat or they will take the shape of the object you place them on. This includes hanging them over the edge of a table as it will put a crease in them. A refrigerator, side of a file cabinet, or the back of a flat metal door are great places to store magnets when not in use. When sticking them to the side of a vehicle make sure that the door is clean and does not have dirt on it. Although we use high quality thick magnet mats, we are not responsible for magnets that fall off while driving.