Liquid detergent and cold water have never failed me. I use the hack from old Tide ads, if applying some directly on the stains, rubbing it in a bit, and waiting a few minutes before starting the wash.
Cold water is important because heat can sometimes set stains.
BITD, I used to use the old school Italian method of soaking the stain in olive oil for a few hours, then washing normally. That also worked very well, but Tide's way is easier.
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