I have had to clean the chrome tips once during the winter with Autoglym metal polish and they cleaned up fine. The trick is to wash them when the car is washed to stop build up. I wouldn't scrape or use wire wool as the chrome layer looks to be quite thin (happy to be proven wrong). Best to use a polish or metal polish and then keep them clean.
The passenger side on mine gets dirtier (UK) than the other side - I don't think both sides "open" all of the time if at all on the 530e.
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