Bleach is a little different from an ordinary stain: it removes or changes the fabric’s dye, so you generally can’t wash a bleach mark out. But you may be able to rescue the clothing.
Try these options
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For a small spot: If the garment is colorfast, you can carefully use a fabric marker or fabric dye that matches the original color.
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For a larger area: Re-dyeing the entire garment can give the most even result, provided the fabric is suitable for dyeing.
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Turn it into a design: Larger bleach marks can sometimes be incorporated into a tie-dye, ombré, or intentional pattern.
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For white clothing: If the bleach has caused yellowing or discoloration rather than simply removing color, the safest approach depends on the fabric; don’t automatically add more bleach.
One important warning
Don’t try to neutralize bleach by mixing it with vinegar, ammonia, alcohol, or other household chemicals. Dangerous gases or reactions can result.
If you tell me the clothing color, fabric (cotton, polyester, etc.), and roughly how large the bleach mark is, I can suggest the best way to repair it.
