chrome trim has gone milky?

I have just had the S8 3 weeks now and tidying up trim etc - one thing is bugging me though, the chrome trim has white spots/milky look to it. Tried polishing and some of the marks faded but didn't really make much difference. Looked around the forum and seen that spraying them black is an option, but the car is silver and think it would ruin the look (plus want to keep it as original as possible).

Any ideas of how to bring them back to thier former glory? (obvioulsy buying all new trim sounds like it would be a VERY expensive option)?