Keep a stack of old rags next to your washer and wipe down the glass door after every load of laundry. Give the gasket crevice a quick wipe down as well, then just toss the rag in with the next load of towels. Always try to move the clothes over before the things start to get smelly. When you are not using the washer, leave it propped open. This will help with keep it dry inside and the mildew from building up.