Hmm, keys and other goodies love eating these materials!
When I bought my E90 there were a few areas where the soft coated plastics were slightly scarred like this and I asked the salesman if they could be replaced or properly fixed. He said that they take the car to a place that strips and resprays the damaged areas, and I must say they did a good job. Not sure where they took the car but I would think it is somewhere in the southern suburbs, Claremont/Diepriver etc. I bought the car from
Constantiaberg Autos. So if you're in the Cape area I'm sure they will be able to sort this out, but maybe some more suggestions...
Philip