Whether it's white baseball pants or gold football pants those grass, dirt and turf stains can be tough to get out.  Most try using store bought products to try to remove the stains.  Another great parent hack, take the pants before washing them or treating them with anything to the car wash.  Hang them up on the car mat rack and use the hot water high pressure water to blow the stains right out.  After removing the stains and dirt you can just wash them as normal.