Stains

My moms couch has so many stains on it. I know it's probably 99.9% our fault! She has had this furniture for 20 years, and had it recovered a few years back. They use to have a rule that you could only eat popcorn on the couch. Once we moved in and sippy cups came along the popcorn rule went out the window. Now mom is in need of a team of steam cleaners to come in and freshen up her couch! We now keep it covered with a sheet. That helps to hid it but not clean it! I also run the vacuum over it from time to time, but it really needs a steam cleaning! Have you had success with steam cleaners before?