We have two cats, and although the Cat Genie does a great job of keeping itself clean, occasionally it does need a really good deep cleaning, and this product does the trick.
The first time I used it I took my whole machine apart to see how dirty it was inside and it was filthy, especially under the processing unit. After one cycle of the cleaning cartridge it was like a new machine again! Warning...the cartridge needs to be used after a full cleaning cycle, and it does take roughly an hour to complete the cycle. So only run it when the cats are napping, and right after you know they have used the potty.