Empty washer develops an odor after a few hours of no use

Washer Repair
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Brand: whirlpool
Model Number: WTW4950HW0
Main Symptom: Water odor after a few days
What happens & when: after a few days if not used, the washer develops an odor. I assume it’s from a tiny bit of water left in the bottom of the tub. So little we can’t see any.

We are on WELL WATER. this has just started in the last month or so. We have been using the washer for about a year. Our old washer had an odor too. I just always assumed it was the well water having no chlorine in it. But since this just started with this one after a year , I’m thinking it’s a buildup of something.

Is there some sort of super cleaner I can run through it occasionally .

This is a newer top load washer.

Thanks for reading !

Error Code (if any):
Parts or tests already tried:
Photos / video link:

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There is a cleaner that you can use called affresh. You would run a cycle empty and drop one in. W10135699 Affresh Washer Cleaner 3 Pack | Genuine Whirlpool OEM In Stock