Best solution I've found: magic eraser. Works like ... magic.Oils never worked for me. Restored some shine temporarily, but the clouding was still there. Magic eraser restores them to like new condition IME.
@cyc wid it It was only available from MartinPatrick3 via phone order. I think it's sold out (there were only ten made).
Mine arrives today and might end up on B&S if it's too small. Only comes in one size.