DC has continence issues. I found a pair of his school shorts in a plastic bag at the bottom of the laundry basket that had sat there for a week over half term (DH very kindly left them there). They were washed as normal and came out smelling of stale wee. I've tried a stain remover spray, neat bio detergent, a hotter wash, extra rinses, strong smelling detergent and fabric softener, etc and I can still smell it. They've been washed 4 times now. It smells better, but it's still there. Does anyone have any suggestions to get this smell out? Everything else is coming out of the washing machine fine.