Removing Sweat Stains from a Couch?
You can use a diluted solution of hot water and oxy clean. Make sure the oxy clean is dissolved, dip a rag into it and rub your sweat stains out. I have kids and this takes just about anything out that is organic on my couches.
Laundry Disaster!
You can use goo-be-gone. Its in a small bottle with a black label in the cleaning or laundry department at Target or Walmart. Put it liberally on each grease spot and throw in the washer. You could also handwash each spot with Dawn but it takes awhile longer...