My wife moved in with her two cats. I absolutely adore these little guys and I would do anything to make them happy.
Anyway, when one of them moved in, his fur was greasy, had dandruff and just seemed odd. The other guy was normal as he is now. We did research and decided to feed them both half a can of natural wet (Maxi Cat is the brand we use) and fill it with two TSPs of water because they don't drink enough.
We've been doing this now for about two months and their fur simply amazing, especially the one that had the dandruff. What's amazing is that his fur has gone from black to a little bit of auburn when he's in the light. It's sleek, shiny and smooth. It's fantastic to feel (he hates it, though!)
If anyone is experiencing problems with your cat's fur, try this method!