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Theres really only one way to remove bleach stains from carpets or upholstery, and it must be done straight away, before the bleach has changed the colour of the fibres: When dealing with powerful cleaning products like bleach, it is important to take the proper safety precautions. Protect your hands and clothing, work in a well-ventilated area, and check the label on the bottle for any additional safety instructions.
https://nandkorganiccleaning.blogspot.com/2021/12/how-to-remove-bleach-stains-from-carpet.html