Great question — answering as the UphillTech team:
My normal course of action to take out a stain is to put dish soap on the stain, then hold the garment with two hands on either side of the stain about an inch or so apart and work the fabric back and forth. Also go in a circular motion against both hands. The stain will become fainter and fainter until gone or unnoticeable. If greasy, work cooking oil into the stain using the method described above, first. The oil will dissolve and loosen grease within the fabric, and the oil can be easily washed out.
Full answer by subjectivist: https://lifehacks.stackexchange.com/a/5720 (CC BY-SA 3.0).
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