Hello, just a quick question about the factory rear hatch spoiler for the XB. I decided not to get this option when I got my 2006 XB. But now I am thinking on getting it. So here is the question. I've noticed when it rains the rear window get's real dirty and I have to clean the rear window alot. So does any one that got their XB with the rear factory spoiler notice that thier rear window also get's dirty? or does the rear spoiler keep the dirt off ?