White residues on the plastic of the rear VW emblem, how to clean?

First of all, hello dear motor-talk forum. I’ve read articles from you many times and have helped me a lot. But now I can’t get any further and need your advice directly. I’ve had a Golf 6 1.4 TSI with 122 hp (Bin very satisfied) for a week: The problem you probably recognize directly at the picture (it’s about this white) The dealer said that he only had Sidolin at his hand and that it was a little less, but that’s not the case. Of course I would like it to go away completely. Do you know by what means I can get rid of it all?