Our carpet shampoo formula is so unique, it’s in a class of it’s own. Because our formula is 100% odorless, it makes your carpet odorless. Yes, that’s correct. It returns it to hold no smell! Determine the size of the tank on the machine you are using and mix the formula with the water in the extractor tank. (2 oz. of formula treats 1 gallon) Shake well and you are ready for extracting. The 4 oz. bottle mixes with up to 2 gallons of water and is enough to do an average size bedroom or hallway. The all natural formula is eco friendly and because it does not contain a scent, it holds no oil. This gives you the assurance knowing that no toxic chemicals are being sprayed into your carpets, around you, your pets, your plants or other people. Shelf life is 2 years from date of purchase.