How could something going into the air intake get to ANY parts of the carb? The fuel bowl where the needle valve, float and jets are located is pressurized with fuel and is not connected to or accessible from the intake except where the jet injects fuel into the air stream in the intake.
The only thing the intake of a carb connects to is the air side, and the air side doesn't get clogged like the fuel side. The only way to get cleaner into the the jet while the engine and carb are assembled is to add it to the fuel. If the jet is completely clogged, you won't have any flow and it won't clear.
I've seen lots of carbs where you can't even get the jets clear when you take them out and soak them overnight in carb cleaner and spray through them. The only sure way to get a carb jet cleared is to use a soft wire and push through the hole in the jet.
Well guys there are 4 real good mechanics and 1 performace engine builter in my area and all use Deep Creep. They tell me and have shown me how well it works. My old boat the one I talked about spraying with Deep Creep had floats sticking, after spraying no more problems. So I think it does work. JMHAO
It can't. There is no physical way for something going in the carb throat to get to the float. The carb throat is at low pressure and the fuel bowl is at fuel pump or gravity fed pressure. Deep Creep is great for clearing carbon and fuel residue out of the throttle body or intake, but it won't do anything for the fuel system.