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I had left some wet clothes in a damp place for somever days due to my carelessness. The clothes have now developed black mould.
Washing clothes with detergent simply does not help.
What is the way out?
Wash them again in the hottest water safe for the color of clothing. After putting the clothes in the washer, pour about two cups of white vinegar over them along with the detergent.
You can try the following methods
More reference here