Suction-Cups-Free Car Window Sun Shade are amazing you don't have to do anything but take them out and press them right on the window. When you need them off the window you take them off and put them in the little bag that you get when you but them. My children love that they can see out of it as well. I don't have to worry about the sun coming in and making my children hot and they can still see when we are out on the go.
Make sure not to set anything on top of the press on part of it will trip it almost had it happen to one of mine when some one took it off the window and got under the car seat.
Come check out Mr Bene Sun Shade at amazon.