Streaking is most commonly caused by undissolved washing powder or tablet detergent residue. This can happen when the washing machine is overloaded and detergent gets caught in the folds of clothing. Too much of a good thing? White streaks can happen because you’ve used too much detergent.
Besides, can laundry soap stain clothes?
Laundry detergent isn’t designed to stain clothes. However, if you use powdered or even too much liquid detergent on your clothes, you might find detergent spots. The key to getting rid of these detergent “stains” is breaking them up and rewashing the clothing. A simple way to do this involves using rubbing alcohol.