To iron polyester you need to use a low heat setting. However, even the most diligent of homemakers can scorch or melt polyester. Scorched or discolored polyester is fixable. If the polyester melts and becomes shiny or hard, the fabric cannot be repaired. You can fix old scorch marks, but it is best to fix any scorch marks as soon as they happen to prevent permanent discoloration.
Things You'll Need
Fix a Fresh Scorch Mark and Wear It Now
Place a washcloth underneath the area of the scorch.
Soak another washcloth in white vinegar.
Dab at the scorched area to remove or lighten the scorch marks. The vinegar will air dry quickly, so that you can wear the pants immediately.
Wash the pants as soon as you can with color-safe bleach.
Fix a Fresh Scorch Mark and Wear It Later
Immerse the pants in cold water immediately. This will stop the fibers from burning.
Spread laundry detergent over the stain. If you have color-safe bleach, this would be best.
Scrub the stain with a washcloth or scrub brush. The scorch mark may come off the pants at this step. If not, proceed to the next step.
Wash the pants in a washing machine on the settings you would normally use. If the scorch mark is still visible, proceed to the next section.
Fix an Old Scorch Mark
Turn the pants inside out.
Place a washcloth beneath the scorch mark.
Use an eyedropper to soak the area above the scorch mark with hydrogen peroxide.
Add one or two drops of ammonia.
Allow the hydrogen peroxide and ammonia to soak for 10 minutes and check the stain.
Continue soaking and checking the area for up to 1 hour or until the scorch mark is gone.