Personally, when I use Amsoil's Power Foam, I just be sure to spray the throttle plate like crazy while treating the top-end. That way, while the engine is sitting after the can empties, I can wipe off what it helped clean at the throttle plate. That and a fuel cleaner is about the same price as the 3M DIY kit altogether, what the OP paid anyway otherwise you are paying a lot for what is included. Isn't the same thing bieng accomplished?
Unless, of course, the 3M kit is supposed to be a professional level product(not typically used by walk in consumers).