I guess it depends how deep the marks are but I think the only long term solution that seems to work is to use an abrasive like the various grades of wet & dry, probably goes totally against the grain to take sandpaper to something clear but unless you want the clouding to come back you've got to remove the top layer of the lens.
I've lens covers on mine since new so when I remove them they sort of look out of place compared to the rest of the 14 year old Golf.
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