DS is working on night training, he's four and a half, and I hear it's harder for boys. He doesn't have day accidents, and it's fifty fifty at night. Anyway, he had an accident, I washed the sheets and some other clothes together in the hot hot cycle they were dried in the hot cycle too. When I removed the clothes, they still smelled mildly of urine. I use hypoallergenic detergent and no dryer sheets. Any thoughts?