RedHawk -
FWIW, they won't really clean off, although they will clean up a bit. What you are seeing is the result of the paint being rubbed through, exposing the aluminum underneath. The aluminum oxidizes, producing the black powdery mark you see. You can clean off the black powder, but the bare aluminum will still show, and will oxidize again.
Use the Search tool to find posts on UHMW tape. It is an easy preventive, but you need to get it in place as soon as possible, before the rubbed areas become too large.
Bill
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