For years my mom has been using a bar of Fels Naptha to remove laundry stains. I’ve tried other products over the years, but I always end up back with this one. A lot of grocery stores carry it, for about a buck. And heaven knows with four kids under 8, we’ve got a lot of stains around here.
I just wet the bar and rub it onto the stain, and then use an old toothbrush to scrub. My mom found these plastic mesh bags, and gave me some. So now I tie the bar into a bag, and the bag acts as the scrubber.