Can’t get the wrinkles out!

The screen came folded with many wrinkles. It had a smell that dissipated after a couple days. The card that came with it suggested to soak for 5-10 min in warm water to relieve the wrinkles. I have done that process twice over 3 days and hung it up in between. There are still wrinkles but I decided to use about a dozen clamps to stretch it over my frame prior to stapling so I could see if the wrinkles came out. Most of them did but I still have many horizontal line wrinkles and other star shaped wrinkles from the corners. They don’t show up in pictures that well but they can be seen easily from 10’ away in normal light. Has anyone been able to get the wrinkles out?

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