When our live-in helper left last year, I flipped when I opened the door of our washing machine. Having had a live-in helper for over 10 years, I hardly ever touched the washing machine. The first thing that greeted me when I opened the washing machine door was mold. The rubber tube sealing the opening of the washing machine was so badly invested with mold that I could not even wipe them away. I almost fainted when I opened the detergent and softener drawer. The interior of the drawer was completely black! Black with mold! Fortunately I could wipe off 80% of the mold but I could not reach the deep end of the detergent drawer compartment. I spent almost an hour cleaning the dirty sh*t left by our helper. I almost wanted to get a vest mold fogger to remove the mold from the washing machine but that would take time. I had a few loads of dirty laundry to do at that time. I think that lady never ever wiped the washing machine despite me telling her to do so. My mistake was I did not have the time to check on the washing machine. Even if I have a new live-in helper in future, I think I will handle the washing machine myself after this bad experience.
Try running the machine with white vinegar. Good idea to put a cup of it with every wash too. As well, when not in use, leave the machine open so it can air dry.