How to Repair Bleach-Damaged Fabric

Apply sodium thiosulfate to the stain. Sodium thiosulfate is better known as photo fixer -- the chemical applied to a photograph in order to cease print development in a darkroom. You can acquire some in almost any store that sells print photography supplies. It works best as a spot treatment, applied immediately after the bleach stains the fabric. Dampen a washcloth with the fixer. Dab it on the bleach stain. Rinse the garment under cold water once you have saturated the stained area with fixer. Repeat the process until color returns or the stain no longer responds to the treatment.

Apply white vinegar to the stain. Moisten a washcloth with vinegar. Blot it on the stain until you have saturated that portion of the shirt with vinegar. Rinse the garment. Repeat the process, as needed.

Fill in the stain with marker or fabric dye. This works best on small stains. Try coloring the spot with marker until it blends in with the rest of the garment. Alternatively, try applying fabric dye to the spot. Follow the manufacturer's instruction for dye application.

Rinse the garment with color stripper, a chemical compound designed to remove color from fabric.

Apply bleach to the whole garment. You may simply not be able to mask the stain. If all else fails, bleach the rest of the garment so that the coloring is uniform once again.