L.S.
Something I use that works really well is Zout. It works especially well on red/brown stains and greasy stains. You put a little on the stain, agitate it (with toothbrush, fingernail - whatever) then wash. It can sometimes be hard to find, but I have found it at Walmart and Walgreens.
Don't get the spray, get the gel. The spray doesn't work as well for some reason.
HTH
L.