[oem4me]

I probably should not comment because I'm not familiar with these particular caps, but if they are aluminum, then they are anodized. If said anodizing has turned cloudy you will never be successful polishing them unless you strip the old anodizing off and then polish the raw aluminum. Of course, this means a total repaint too. Anodizing remover is available as a specific thing, or you could try general oven cleaner in a pinch. Either way, restoring shine to trim with clouded anodizing is a lot of work, not at all like a simple wax and buff.