Arm & Hammer Litter Baking Soda Double Duty Cat Litter Deodorizer, 30-fl oz; Help keep your kitty’s litter box purr-fectly fresh with Arm & Hammer Litter Baking Soda Double Duty Cat Litter Deodorizer. Designed to eliminate unwanted smells with the power of baking soda and odor neutralizers, you can use this deodorizer with just about any type of cat litter. We all try to stay on top of changing our cat’s litter frequently but sometimes life happens. Arm & Hammer Double Duty Cat Litter Deodorizer is there for you and your kitty, helping keep things fresh for just a little bit longer.