We get a lot of calls from customers who have front-load washing machines with mold and mildew in the door gaskets. While one brand (Asko) has eliminated the door boot altogether, mold and mildew are actually less a function of the design and more a product of how the machines are used.
It’s easy to avoid mold and mildew. It’s very difficult to get rid of them.
With all front-load washers, remember to unload wet clothes as soon as possible, and keep the door and the dispenser drawer open when the machine isn’t running. Keep a rag near the washer, and use it to wipe the glass and the bottom pocket of the boot after each load. Hang the rag to dry on the door. As always, use H-E detergent; regular detergent makes foam and suds, giving the mildew a perfect environment to grow. The dispenser drawer is removable. Use a plastic-bristled brush and Tilex or a similar product to clean that space. Finally, use a washer cleaning product that will wash any remaining detergent down the drain.
One day, appliance manufacturers will add a fan to quickly dry the space between the basket and the tub after the clothes are removed. Until then, it’s up to the owner.