And it was a dusty country road. But the bad thing were the bugs, they impacted at the front of the hood/kidneys and streamed a line all the way to the windshield washer sprayers...! There's no way to avoid what you run into on the open road, unfortunatly there is nothing that can protect from it either. After our run over to Lakeland and back yesterday, there is some dust on the back window but probably less than what I would have seen before the roof spoiler. So, I think an improvement but not a full cure.