my humidifier is set on 2

I clean my mask, hose, and humidifier with gain dish soap and let them soak in the sink in the soapy water once a week. I change my filter once a month. The odor is kind of a musty smell. I use distilled water.

Every night when I put on my mask, there is a foul smell. I clean my mask, hose, and humidifier regularly with dish soap and warm water, but even then, the smell persists. Is there a safe deodorizer that I can use? Any other suggestions?