I love my front loader machine.
I go to Leslie Pool Supply, and buy the powdered Chlorine Bleach. I was getting spots on my colored loads after using liquid bleach, so I read about this and decided to try it. Never have turned back to using liquid bleach.
Only use 1/2 Tbsp, it is highly concentrated (for pools). I add it to the space (with the) detergent, and I've never had a problem with odor or mildew. I also keep the door open between uses. It's very important to never put the powdered bleach in the bleach dispenser.
It really does the trick and keeps the machine clean, and disinfects my whites.