If you've recently switched from a top-loading washing machine to a front-loading washing machine, here's a new habit that you may need to reverse: leave the door ajar.
The tops of the top loader washer do not seal so that the small amount of liquid remaining in the drum chamber only evaporates between charges. The humidity in the chamber is usually never high enough to cause problems with mold and mildew. You can not go wrong if you leave the lid open just to be on the safe side, but that's no big deal.
Front loader washers, however, seal off ̵
In view of this you will not be surprised that many people had problems with mold and mildew in their washing machines. Indeed, this is such a problem that in recent years several class action lawsuits have been filed against a number of equipment manufacturers, relying on the argument that their machines are defective and prone to injection molding.
We will stay out of the debate about the technical merits of different washing machine models. This simple solution works regardless of what kind of front load washer you have: leave the door open.
Done. Although I have always left my front loader machine wide open between uses (because my washroom has plenty of room for it and I have no reason not to do it), you really only have to crack it a few inches to ensure that humid air can evacuate the machine.
If your machine is in a closet or common area of your home and you want it to stay cracked with the door wide open and in the way, handy products like the popular clothes lighter or so easy latch can help keep the door open when Do not use the washing machine.
Whether you leave the door open or use a small utility tool, the critical part is to circulate the air to remove the warm humid conditions in which mold thrives.