I did get the idea of using window cleaner on my diamond plates from Sellers. Tried it, and I like the feel, which gives for lack of a better term, I bit of resistance to the push of the blade, and makes the edge feel like it is sticking more solidly to the surface. IME it also tends to get rid of the swarf much more readily than water, and keeps the diamond plate cleaner longer.
As far as water stones, no, he does not as far as I know use it with them. If you read my original post, I was asking because if I want to continue to use it on my diamond hones, that means I'll have to take both water and window cleaner out to the bench with me when I work. I work outside, and tote my tools from the house to the bench. One less thing to carry is always nice in that regard.
It makes no difference in the edge, so I could technically stick to just water, if I wanted to.