Which oxi clean cleans out the tough carpet stains 1,2,3,4,5 or something else that gets the tough stains out?

Do not use any laundry detergent on your carpet. Oxy Clean and similar products will permanently damage the carpet dyes, especially in Nylon carpeting. One of my customers actually raised hell over the phone with the Oxy people and demanded that they replace there damaged carpeting. This was about 6-7 years ago. I have personally seen over a hundred damaged carpets as a direct result of the home owner trying to clean spots from the carpet using that product.