How to install reflective window insulation sheets

Like most RVers, we spend time in warm, sunny climates. We have reflective window insulation sheets that we want to hang in order to reflect sunlight and keep the RV cooler. How to hang them? We tried "command strips" and, while the hook-and-loop part sticks together, the adhesive ends up releasing. Our solution is to use "bulldog clips" that come with push pins and then earring backs to hold them to the frame. We drilled 1/16" holes to put the push pins through. Aside from taking down the valences, this is a very easy solution!