Oil or Grease
"Grease is just horrible," Weiss says. "You can totally get it out, but it can take a really long time. I had a shirt that had olive oil on it, and I had to re-treat it about 10 times." The best thing for grease is Weiss's beloved Dawn dish soap. Mix a little water in with Dawn to make a solution, and then rub it into the oil spot or grease stain with a finger. Let it sit 10 to 20 minutes before washing. For small-scale grease spills that are still liquid, Weiss says to either rub them with chalk or sprinkle corn starch on them, and let them sit so that the oil gets fully absorbed into the powder. Brush off what's left into the garbage and then wash as usual once all the oil is gone.