My LG front loader has a small hose behind a panel on the lower front where the drain pump filter is. When I am finished washing I take the plug out of the hose, drain all the water, then remove the drain pump filter and leave the door open until I next need to use the washer. Otherwise, there would be ~500 mL stagnant water in the plumbing of the washer, keeping the humidity inside the washer comfortable for mold.

Also, use warm water and half the suggested amount of washing powder.