Streaks on plastic panels

There is streaks that go down my plastic panels and i can't get ride of them. I notice then when i am up close and i have washed it and they don't seem to be going away what do i do?

Blast !!! :D

It's been talked about on the boards at length. A quick search rivaled 11 threads on this subject.

The one that stands out is the one on the lower portion of this page. It's in the similar threads section.

I hope this helps. It helped me, when I want looking.

Dom