There's really nothing simple about water/alcohol injection, to my knowledge... but when I feel my engine needs a good clean, I just spray some hot water down the throttle body from a heavy-drop misting bottle.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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