Take equal parts white vinegar and alcohol (250 ml each) and combine them in a container.
Dip a clean cloth into this mixture.
Gently dab (don’t rub!) the bleach stain with the dampened cloth.
Rinse the treated area with cold water. If the stain remains, you might need to repeat this a few times.
Solution 2: Sodium Thiosulfate Method
Mix 1 tablespoon of sodium thiosulfate in 250 ml of water until dissolved.
Soak a clean cloth in this solution.
Once again, gently dab (no rubbing) the stain.
Rinse with cold water and repeat until the stain vanishes.
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