There is a brilliantly simple solution to this.Use Autoglym Instant Tyre Dressing. Wash car (and you dont have to wash the honeycomb parts beyond running a sponge / mitt over the front)... rinse off... whilst it's still wet simply spray this on and leave it to dry. Perfect black finish every time and no effort at all!If you haven't tried it you won't believe me - trust me it really is this simple and the result is perfect every time.Go on.......