Toss one or two curtain panels in the dryer with a damp washcloth. Tumble dry on low about 20 minutes. You can also wash them, per label instructions, and then dry them to remove the wrinkles.
Iron the backside of the curtain using the setting recommended on the care label. Use a pressing cloth with some panels, such as those made from suede, to avoid damaging the fabric.
Steam curtains that are still hanging up with a garment steamer, holding it about 3 inches from the fabric.
Hang synthetic sheer curtains up immediately after laundering them. They will dry quickly and hanging will eliminate any wrinkles.