Write the next sentence in the following story.

How to fix a front load washer so that it does not smell with washer fan
Understand what causes the smell to begin with.
It is multiple types of mold (including black mold) growing in the internal drain hose inside your washer where you can't see it.
Understand why it grows there.
Search " mold growth " and you will see that the biggest problem is high humidity (over 60 %). This chart shows you at what relative humidity mold starts to grow.