Causes of black collar of down jacket
When wearing a down jacket in winter, the collar on it will turn black, mainly because the dirt on it will accumulate after wearing the down jacket for a long time, which will lead to the collar turning black. It is best to wash it properly at ordinary times, or send it to a professional dry cleaner for cleaning to remove the dirt on it.
If it can be washed with water, it can be scrubbed locally. It is not recommended to wash them all at this time. It depends on whether the label on the clothes can be washed. If it can be washed with water, first keep the clothes dry, then apply some laundry detergent or cleaning liquid to the collar and let it stand for about 5 minutes.
When the stains on the clothes are removed, dip a clean towel in some water, and then scrub the dirty parts of the clothes repeatedly. If the liquid enters the inside of the collar, rinse it with clear water to completely remove impurities from the clothes, then wipe it with a dry towel and dry it in a ventilated place.