Provideing the coat you are applying the wash to isn’t enamel, you won’t damage it. I use normal White Spirits to thinn my oil paint have have only had a problem when i didn’t cover the enamel base correctly.
Mona Lisa Odorless Thinner…pretty widely available here in the US - I’ve seen it at Hobby Lobby, Michaels, the local art supply store, etc. I believe it’s actually a brand of odorless turpenoid, but it’s very not-harsh and I’ve found it ideal when working with oils.
I use Tamiya acrylic paints as base coats and will use a Vallejo acrylic glossy top coat as a base for decaling and pin washes. I’ve read that an acrylic paint, once fully dried, will survive an oil paint thinner. This is true, isn’t it? About 20 years ago I was into oil painting (with turpentine) and I still remember the viscious, toxic odor of turp.