I'm a baseball/football mom so know a bit about laundry problems.
A big splash of vinegar will help freshen up sports clothes/uniforms.
Also a SMALL bit of Dawn dish soap (or spray) will bring up oil drips from pizza and other yummy foods that are messy.
Grass stains and rubbed in dirt:
White Brite
Oxy stick/spray
Zote bar
That's all I know
