Read the fabric care label. Not all drapery fabrics are washable. If your draperies are dry clean only, you will need to take them to a professional. Not all water damage can be removed, but your dry cleaner should be able to tell you if he or she will be able to remove the stain.
Identify the fabric type of your washable draperies. Cleaning agents affect fabrics differently, so it is critical to use the proper agent.
Treat the affected area. If your washable draperies are silk, wool or acetate, use white vinegar on a damp sponge to blot the stain. If you have a fabric other than silk, wool or acetate, use rubbing alcohol on the sponge instead of white vinegar.
Dry the treated area with a hair dryer set to the lowest, coolest setting. If the stain is gone and the fabric is a uniform color, you can stop here. If the treated area looks different than the rest of the drapery, you should continue with a full laundering.
Wash the entire drapery either in your washing machine or in your bathtub. Your machine’s load capacity may be too small for a large window treatment, so it’s better to wash them in your bathtub where there is room for fabric movement. Select cold water and the gentle cycle for a washing machine.
Dry and iron curtains according to care instructions. As a general rule it's always best to use the low or no heat option and to remove the drapery from the dryer as soon as the cycle ends to reduce wrinkling.