If all you wanted to clean was the valves, combustion chamber(s) and the top of the piston(s), All one would have to do is pour a little(I'll say it again, a LITTLE water) down the carb as the engine is running and they will be as clean as a new engine.
On one of our turbo cars we run water/meth injection and when we pulled the heads to repaint the tops of our pistons every thing was so clean, you could eat off it.
ROD
On one of our turbo cars we run water/meth injection and when we pulled the heads to repaint the tops of our pistons every thing was so clean, you could eat off it.
ROD