Water into the induction was once a rather common way of removing carbon from combustion chambers.
I once watched a friend of mine set the fast idle cam on his 348 WCFB (58 engine) onto the highest step and put the car wash spray nozzle into the carburetor air horn on his 57 Bel Aire. There was a lot of steam and noise but the engine continued to run. Of course, it ran no better after the "de-carbon" procedure than it had before.
That said, carbon build up is not Bill's problem.