Whitney on the forum told me about lime sulphur spray. It is a garden product for scale insects and rust (fungus). 1 Tbsp per gallon of water; I put it in a spray bottle. Once you mix it up, it only lasts about a week or so and you have to make a new mixture, but it is very effective. Does not smell good, though. Applied a couple of times on dandruffy areas or tails and you will see a marked improvement. I've had better luck with it than with Listerine. After I clip this week, I am planning to bathe my boys with it. On tails, I try to get some on the end of the tail bone and also spray it at the top of the tail.