Whistlepig, I took a look at the bottle. Of course they only listed what they have to for ingrediants, but it reads organic salt, surfactants and fragrance. No phosphorus. So, you are correct sir.
I know ammonia eats away at brass, but I have cleaned some of this brass half a dozen times with the diluted Kaboom, Dawn and water mix. I inspect the brass closely and see no erosion and certainly no case splitting so far.
You might have noticed that I had poor results on nickle cases with the stuff and since you prompted me to actually read the label, I think I now know why. The label says not to use on things like frosted glass, aluminum and galvanized metal. I take it that means plated metal ie: nickle then, and that is why it doesn't do much for nickle.
Anyway, I am still using my little formula, since I only shoot BP and I have to stick fired cases in water and something while at a match and for the trip home.
You can bet that if I find something about it that is detrimental, I will let everyone know.