You can tumble the panels in the dryer with a towel that has been wet and rung out so it's not dripping. Tumble on the lowest heat setting. You can do this with the new panels, which should then be wrinkle free. No laundering needed. This has worked for me. Hope it helps you.
Yes, you can wash them, but they will lose their wrinkles best if you put them in the dryer after they are washed. If you don't have a dryer, it won't hurt to iron them. Just use a lower heat and some steam. The "crushed" effect won't iron out.
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