It's actually not that much of a problem when it rains. When i still had that spoiler, i couldn't see anything at anytime through the rear window, no matter if it was raining or not. When I get my car back from painting, I will buy some of this stuff called "Rain-X" or something like that, when you smear it on your windows the water just... you know, its like the windows are polished and the water wont stay on the window. Did anybody understand what I just wrote(fuck my english)?