Miata Mailing List: October 2000, Message #838

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I found the following at http://www.miata.net/garage/trix.html and wanted to ask some questions about this:

>Clean Those Fuel Injectors
>
>This one's from Percy M. Chow:
>
>"How about a smoother, consistent idle and throttle response? I've just recently bought a bottle or STP Carb cleaner. About every oil change I pull one of the >hoses going into the mouth of the throttle body and spray it into the throttle with the engine at fast idle. (Normal idle kills the engine.) The difference is dramatic. >Way smoother throttle response and hey, keeps those injectors CLEANER."
>
>As a further comment, Percy also runs a tank of premium through about once a month for further intake system cleaning.


Since the STP is being sprayed into the throttle body how can it be cleaning the fuel injectors?  I can only think that the portion of the injector that protrudes into the intake manifold is being cleaner but not the nozzle itself.  Can someone clarify this for me?  BTW I do believe a cleaner throttle body and intake manifold are beneficial.