They are very easy to use and they still stick perfectly to our windows! We've been using them in Minnesota since September and it's now May. While I can't comment on how they stick to windows in the heat, I've had no problems with them in the fall, winter, and spring. They stick easily to windows and are easy to clean and wash. I think the problem with windows like this is finding the right size for each car. We used this in Santa Fe, Soul and Rav 4 and it was a good size.
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