To add to Marshall's comment, if you add heat (sunshine through the window) and humidity (moisture as in steam) then you'd essentially be "using a steam iron" to remove the creases on the sheet of paper in his example. The same thing happens if your pleated window shades are pulled down "tightly" which sets them up for a "pleat delete"....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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