Actually,
It is an old trick that goes back to the Model "T" days.
What it does is: cause the hot carbon in the chamber to flake off because of the cold water.
Now as far as removing carbon, if it ain't broke don't fix it.
With today’s oils and no lead Gas, the carbon build up is a lot less than it was many years ago.
When I was a pup growing up in the early 50's,
I remember many many vehicles that were followed by a cloud of blue smoke.
Today you almost never see that, as the oils are better, and oil control rings are better.
If you remove the head, and clean the carbon, remember to suck the carbon from around the piston/wall area with a shop vac, ya don't want to blow it out with compressed air as a small bit will find it's way between the top ring gap.
The only thing harder than carbon is diamonds
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