Ditto what Jim said. Ramco has extremely poor quality on their finishes to the point they were called Crapco mirrors on these forums at one point.

A good plating shop can strip, polish and replate fo rless than the $1800 or so that the replacement cost will be. In a few hours you can have your mirrors off the coach and disassembled.

Prevost sells new terminals to replace any you damage when you disassemble the harness end.

The quality issues we all have relate to corrosion silently and invisibly eating away beneath the surface of the chrome on the aluminum. When it does become visible it is beyond a simple fix like metal polish.