I use this method and infact removed a salad dressing/vinaigrette stain today from an 80/20 in a home where the guys disabled and on medication.
NO solvents could be used.
Kit: One-step spotter,terry towel,steamer and extractor.
Procedure:
Spray one step onto affected area, cover with terry towel, using hand held steamer blast over terry towel with steam, using your body weight stand on terry towel.Stain is absorbed up , extract off remainder in usual manner.
Stain's gone,no residue,no chemicals .
Simple and effective