
The engine turning is fragile and lightly applied. Any type of abrasive will ruin it. I've had success with Nevr-Dull (available at most local hardware stores). This will take A LOT of elbow grease, but will be worth it in the end.
Just pull a wad of the wool out of the can and start rubbing vigorously. Wipe it down with a clean cloth periodically to check your results, and then go at it again, repeatedly.
When done buff it out with a clean soft cloth and apply a coat of wax to preserve it.
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