Good question. The main things are keeping the rubber gasket clean around the door, as it traps moisture and can get mouldy, running an empty hot water cycle with vinegar or a commercial cleaner monthly to clear out detergent buildup, and checking the inlet hoses for any signs of wear or bulging. You'll also want to leave the door open between uses so it can dry out properly, and wipe down the drum occasionally. Beyond that, it's mostly just using the right amount of detergent and not overloading it—treating your washer well keeps it running for years without needing repairs.