I've read about slowly trickling water down into the throat of a top-mounted carb on a running gasoline engine to decarbonize the piston tops and chambers, although I've never tried it myself. I suppose it's the rapid expansion of the liquid water to gaseous phase that blows off the crud.
Oscar Zuniga Medford, OR Air Camper NX41CC, A75 power Flying Squirrel N7238B, VW power
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