I picked up a bunch of fuel injectors 10+, more than half leaked or after cleaning had bad spray pattern. Used Walmart carb cleaner, with hose in injector, sprayed, let soak, blew out with air, used air to open pintle, put 2 pieces of toothpicks in seat to hold open, into the ultrasonic cleaner for an hour or 2. Carb cleaner and air again.