i wouldn't dissolve them in the body, or even break them up in the body. whats inside of the stones is toxic to the body, and if you break them up or disolve them, you let all that crud out into general circulation. i'd rather get them out whole and unbroken, i think that's safer and betterer.
i think there have been a few people over the year that i've been checkout out this forum that have tried to disolve stones with herbal tonics and agents. i don't personally remember of any people that wrote back that they were successful, other than a few people that had some luck spontaneously losing the stones with chanca piedra or gold coin grass. funny though - there is no uniformity, chanca piedra doesn't do this for everyone, nor does gold coin grass.
You might want to do a search on Hydrangea Root. I remember reading some things about it when I first joined Curezone over three years ago. Still, I agree with Lisa, its much better to get the stones out through flushing if you can.