I replaced my accent with an echo, and when I cleaned it it looked great, but the now dash looks blotchy. I used meguiars natural shine a few days later and it looked good again, but it seems to have dried out and now looks blotchy again. None of the other surfaces I used this on looks blotchy. It's only the textured, black, plastic dash area in the front. What is it about my new car that dislikes being cleaned?