This bike spent several years in a pole barn on a working farm in West Virginia and accumulated a coating of brown dirt. Fortunately, it hadn't progressed to the corrosion stage and all these parts will clean up nicely with a combination of modern cleaners and a few tools, but mostly old fashioned elbow grease.
After a good scrubbing, some light wet sanding and hand polishing these parts are looking showroom fresh.
In some cases I've stripped, smoothed and polished these parts, but on this restoration project I've decided to leave the original casting marks and simply refinished them in silver wheel paint with clearcoat. A fresh OEM shift rubber and they're ready for mounting.
Also cast aluminum, they will polish up nicely on the buffing wheel. They weren't a mirror finish when new, so I just buff them to a satin finish and clean up the adjusting bolts. In this case, a little TLC goes a long way.
To bring back the original finish I lightly wet sand the chain guard and apply one or two coats of Griot's Bumper & Trim Reconditioner. This stuff works on all the black plastic parts, like the rear fender/license plate area.
(click on an image to enlarge)