Scotty, I purchased a pneumatically operated fuel rail/injector cleaner like you demonstrated in your video about cleaning fuel injectors ( https://www.youtube.com/watch?v=bKGI9N_yWd0). What would be a good chemical to use? You spoke highly about Gumout Multisystem cleaner in a different video, but that seems to be intended for adding to a tank of fuel. Can it be used full strength in a cleaning system? Also, Berryman offers a product called 1126 B-12 Chemtool Thru-Rail Fuel Injector Pour-in Cleaner. Anyway, what you do suggest? For ease of ordering, if there's something you thing is good and available on Amazon, that would be perfect. But don't let being on Amazon limit your recommendation - I want what you think is best/most appropriate for use in a 1995 Jeep Grand Cherokee with the 4.0L straight 6 engine. Thanks!!