Wash stinky, sweaty, greasy clothes in hot, it helps dissolve those things. Add at least 1/2 cup baking soda to the drum (front or top loading), this cuts grease and smells. It also helps boost the detergent and does not ruin clothes.
Wash super dirty clothes on a heavy cycle.
If they still stink after that, you need to replace those clothes. Plastic clothes will eventually get nasty.