Great - thank you so much!
Yes - sewing machine oil just on the moving parts! I've already got it, so that's why I'd use that.
I really don't think the wheel has a finish on it, though I can look around to see what options might have been available - it just doesn't feel or look like it's got anything on it.
So I'll just plan to use a mix of soapy water with some anti-fungal essential oil for cleaning (will take a look at the diagram - I was lucky and it came with the manual - to see about taking it apart or cleaning as is). Then rub some wood oil on. I think we have some tung.
I'm not crazy about plastic bags, either, but as "everything" made of natural materials seems to be molding at the moment, it's the best solution for now. I'll try adding some lavender oil, too.
Yikes on the patchouli = pot misunderstanding
Thanks again for all your help!