Liquid Intake Cleaner (step 1) and a Fuel System Cleaner (step 2). i read everything from the box to both bottles and it doesnt say how to use it. my guess is the fuel system cleaner goes in the gas tank - obviously. but the liquid intake cleaner (step 1) doesnt say anything besides "Follow instructions listed for the G991 Applicator." what is that; how do i use it; where do i add it; does the engine have to be running; does the engine need to be off but warm; how long do i wait after adding the liquid intake before i can add the fuel system cleaner; etc etc etc.