Berryman B-12 Chemtool Fuel Injector Cleaner (part #0116) is not a great fit for through-rail cleaning system.  Detergent-based chemistry will be more effective.  Instead, the better product and the one designed specifically for that application is B-12 Chemtool Through-Rail Fuel Injector Cleaner (part #1126), which will thoroughly clean fuel injectors as well as combustion chambers.  The words “through rail” do not appear on the front label, but you can tell it’s the right product as the label fades from red to orange to yellow to white and second bullet point explicitly mentions using the product with a canister system.