One was spraying water through the carb with a spray bottle... not sure it did anything, but I don't think it hurt anything either.
More for removing carbon from top of pistons.
Have used Diesel before, works well. The old G.M. top engine cleaner in the metal can was great stuff, but alas no more! Wound have eaten the plastic bottle the new stuff comes in.
AFT works well to mix in the crankcase, more lube than diesel. I have used it mostly to remove crankcase sludge but might loosen up rings.
One last note, change engine oil & filter (if equipped) a 2nd time after a some driving.
my $.02
