Unless the directions instruct otherwise, machine-wash window treatments on a short, gentle cycle, using cool water and mild detergent. Be careful not to overload the washing machine. Tumble dry window treatments on the low or air setting or line dry. Complete the cleaning process by ironing curtains on their reverse side. Alternately, a steamer can make quick work of stubborn wrinkles. Hang curtains from the rod and grab a ladder or chair. Steam the front of the panels from top to bottom. For delicate materials, use a low heat setting. For extra body, dip freshly washed lace curtains in a light starch solution. For a soft look, re-hang the curtains without starching while they are slightly damp. If you use metal hooks, temporarily place a piece of tissue paper under each hook where it comes in contact with the damp lace. This will prevent the hook from rusting onto the fabric.