I use "Meguiar's Gold Class Trim Detailer". I have an 07 D3. When I bought the car second hand in March this year, the first time we had a heavy dew the plastic panel under the winscreen went white, streaky & chalky. Once I put the Meguire's on it brought it back to black & looks fine. Now after a lot of rain it might become a little bit streaky but another quick coat & its back to black again. It also works on all the plastic trim, bringing it back to like new. Very easy to apply & I got it from Supercheap. I'm not trying to push this product, there is many other similar products out there. This is just the first one I tried & it works very well.
Cheers,
Murray

