Hi Mooncookie and welcome! I'd like to suggest ironing again. This time use a water spritz to create enough steam to mellow those pesky wrinkles. Once removed, if it were me, I would use a good starch then make sure they are still square. Steam should take care of the wrinkles, you also might consider a lightly wet pressing cloth. If you use a steam iron, sometimes they can spitter and cause browning spots. I'm sure others will chime in too. Best of luck to ya!