You mentioned forest fires. Wood ash is caustic and may have either come down mixed with the rain, or settled on the beaded up water after the rain stopped. Hopefully the spots are just cosmetic and and can be simply polished or waxed out with a high end product. The suggestions above look good.
It should help that you already had a good coat of wax to begin with.
It should help that you already had a good coat of wax to begin with.
