Once a month, add a cup of Distilled White Vinegar & 1 Cup of Baking Soda directly into the drum and use HOT water for washing. Then, I add about ½ cup of vinegar into the fabric softener compartment and ½ cup of baking soda into the detergent compartment. Set the wash on “Quick Wash” with HOT water and High Spin Cycle. If the mold situation is really bad,use bleach instead of vinegar and baking soda. But make sure you run a few empty cycles just with hot water before doing a load of wash.
Wash your load of towels on the hot cycle and add 1 cup of vinegar… just hot water and the vinegar, nothing else. Let the washer do it’s job. Then, if you still smell a little bit, rewash with just hot water and 1/2 cup of baking soda. Again, no detergent, just baking soda and hot water. Voila!