If you have a multiple pet household, or have just discovered how wonderful Critter Oil® makes everything smell as well as how well it cleans and eliminates household pests, so you use it every time you damp mop as well as spraying and shampooing your pets; then the 2 oz bottle of Critter Oil® is for you. Plus you will save money on the cost per ounce! Because it is bottled in brown glass, the shelf life on Critter Oil® is practically endless.