One of my windows has thousands of tiny white nat-looking bugs on the screen and many dead ones on the bottom of the window. The odd thing is this is a double window and they are only on one of the windows, not the other. Does anybody know what they are? There is a boxwood bush in front of the windows and it is dying, but the bush is in front of both windows. They've been there several days. I cleaned up the dead ones in the window one day and a bunch were back the next day.