Scorch marks are rarely fixable. Try rinsing the item in cold water. Work detergent into stain. Rinse. Bleach might remove the stain, but assuming the fabric is not white, would likely ruin your clothes. You may also want to try cleaning the stain with dry-cleaning solvent or sponging the area with 3% hydrogen peroxide. Unfortunately, this stain may be impossible to remove. If the fabric is delicate, such as rayon or acetate and the iron was set too high, you may have melted the fibers, in which case it can not be fixed.