Mold growth is one of the biggest issues facing owners of front-load washers, but you can reduce the chances that it will start to grow inside of your unit. Use HE detergent, and don’t overdo it with soap or other products (like fabric softener). Inspect the door’s rubber seal and wash it once in a while. Run a load of laundry using hot water occasionally, and clean the washer tub on a regular basis.