Can anyone help identify white marks on my Navy Blue Jeans please. They were hanging in my wardrobe and all of the Blue ones are covered in these marks. I thought it may be damp but it does not smell. I have hung a wardrobe dehumidifier to see if that would help. I have washed them previously at 60 degrees a couple of months ago but now they are covered in these marks again. I have put them in the washing again today. Does anyone have any idea what it is and how to prevent. I am stumped as to what it can be. I would appreciate any advice. Thank you.
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