I initially researched this when attempting to clean my boost (map) sensor, tried IPA, Carb cleaner, electrical contact cleaner and nothing would shift the carbon, eventually sprayed with with the LM 5168 and it was brand new in 2 seconds, also the amount of carbon that spills out the intake when cleaning definitely shows that the solution works. To spray the entire can through the intake takes around 10 minutes, I would say 2 cans are more than enough even though I only used one. I might run another can through in 1000km or so, since my EGR is deactivated it should not get worse than it currently is.