Try this on a small spot. Get another can of the same clear. Respray a small test spot withthe nozzle closer to the surface. You will have to move the can back and forth a little quicker. If you can't slow down the reducer, maybe you can reduce the time before the reducer hits the metal. This might keep it "wet" enough to smooth the finish. If it works, it will be MUCH easier than sanding/polishing the whole interior.

fred
bodyshop.com