Well, Clinton, actually I was thinking about the heat from the sunshine on the guitar---heat is not a good thing. But if it's not too hot, then yea, set the guitar in the sunshine too. I still prefer either the activated charcoal or the lemon/salt trick.

I had a fiddle and case that was full of "wet basement musty smell" and I never did get rid of that in the case. The fiddle did fine with the lemon/salt trick and another case, but the case went to the landfill.