Kitty Kuhn says: We have greyhounds and use Lemon Joy dishwashing detergent mixed half & half with Murphy's Oil Soap to kill fleas & eggs. It can only be Lemon Joy according to the greyhound rescue organization who told me this when we adopted. Greyhounds are very sensitive to any chemicals due to their lean bodies. It works & it's probably gentle enough for cats, too. I don't like putting any chemicals on my animals. I hope this is helpful for you!