What is the best detergent to remove s***n stains from underwear?

Question

My son's (teen) underwear is usually stained. Would like some leads as to best detergent to use or remedy to remove.

Answer 1

Zout is a stain remover.  It works very well!  You just spray it on before you was the clothes on the stains and it will go away.

Answer 2

Why take them out?  They are going to come right back. LOL You made my day.

Answer 3

Zout removes stains. You can find it an any supermarket.