After using the qd of your choice, do you use it on the glass of the vehicle or do you use a separate product dedicated for glass? The reason being is because I've used wipe & shine on my windows just because I didn't have anything handy at the time, but I was told it's really not a good idea because the glass will feel greasy because of the silicone in the product. I didn't notice that much of a greasy feeling. Maybe a little, but not a lot.