that's a good idea ! Do you mean the kind that have suction cups? Wax paper is inexpensive so I bought some so it lets the light in but keeps the heat out.
Do you have a variation to share for this page?
Use Car Shades In Sunny Windows
I like looking outside my kitchen door/window, but I don't like the sun adding to the heat of my room in the summer. I found rear car shades that have suction cups on them. These are an inexpensive way to keep out the sun and still be able to see outside.