What is the best way to clean up wheel bolts for fuch alloys?
I’d like to clean them up or restore them.

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Send them to get clear zinc plated. Wire wheel them if they are corroded.

I had mine plated in solver zinc.

I plated mine myself

The originals were copper plated, then cadmium plated. I have a few sets ready to send to a cad plater local to me.

Mine have black plastic caps. Some are broken. They are a PITA to get off to remove wheels from the car. Are they OEM or aftermarket?

you can get them for Volvo and they are just right in Bk or chrome finish. Ebay or Amazon

Bob B