The specific cleaning steps are as follows:

1. Prepare a basin of warm water with the water temperature not exceeding 30 degrees. Too hot water will damage clothes and fabrics.

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2. Pour a proper amount of bleach into the clear water in the basin. Sodium hypochlorite, the effective component in bleaching water, can react with water and carbon dioxide to generate hypochlorous acid (strong oxidation), reduce colored substances and achieve the purpose of bleaching.

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3. Soak the clothes in the basin. Wear gloves when operating to prevent skin from being burned by bleach. Bleached water can irritate mucous membrane, skin and respiratory tract, so it must be used with caution. If you accidentally touch your eyes, rinse with plenty of water for fifteen minutes.

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4. After soaking for a period of time, take out the clothes and wash them with water.

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Finally, check whether the yellow stain on the collar has been removed.

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