Whats up y’all, it’s not urine! But what are the yellow spots on my white laundry. We don’t use bleach and our detergent is a no dye or color detergent. What are those yellow spots? I want to preserve my laundry not replace it. Basically the are yellow spots random places on the boxers, near the waisteline and on the white tee wherever. We have a water filter for the entire house and the stains don’t appear nessiarily where sweat would be and I do not use any kind of moistureizer.