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I've not had much luck with "pour in the tank" injector cleaner.
What I end up doing about every 100k or so is taking the injectors off the intake, and put them on a fixture I made, and drive them with a simple pulsing circuit and feed them kerosene for a while, then mineral spirits using a fuel pump. Sounds wonky but it works well.
They are cleanable/reusable as long as the coil works.
not sure, i'm wondering the same thing. i bought some pour n the tank stp and was wondering if it will help or hurt. i'm doing this as preventitive maintenance.