Quote:
Originally Posted by Molino
Water creates a more violent explosion in the cylinder since it is actually hydrogen and oxygen. This will blast most all carbon off of the valve faces and pistons. Now that the combustion chambers are cleaned... Russ
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The water doesn't convert to hydrogen and oxygen; that would require more energy input than you would gain because you have to separate the molecules, which have a fairly strong bond. Instead, the water turns to steam, which is pretty effective at cleaning carbon deposits.
Although the OP isn't specific as to what he means by sticking valves, in my experience the most common causes for valve train noise are sticking lifters or maladjusted rockers. If it's rockers, they need to be adjusted; if it's sticking lifters, Marvel is the best I have found.