Believe it or not, the product "Dreft" that is used mostly to clean stains off of baby clothes works GREAT on vintage game jerseys. I recently won a 1978 vintage jersey that was horribly stained and dirty. I sprayed the Dreft on all the stains (including one that looked like an old multiple-washed ink stain) and let it sit for about an hour, then I washed the jersey by itself in a gentle, cold-wash cycle, and voila! All the stains were 99.9% gone.

Just thought I'd share. Will post pictures soon.

Thanks.