Intake Valve Cleaning.

[Booboo]

Has anyone used any cleaner for the intake valves?
There is loads on the net about the carbon build up on direct injection engines.
I've found Wynn's egr3, or even put BG44k in a spray bottle, but where to spray it in? We don't have a maf sensor as it states spray after that. We do have 2 pressure sensors, so will spraying it through the air intake pipe from the airbox be ok?

 

[Booboo]

I've got some intake cleaner spray.
I'll spray some through the air intake pipe coming out of the airbox, some through the air pressure sensor hole after the turbo, just before the throttle valve.
And then remove the mass air pressure sensor in the intake manifold and spray a load down there.
The can comes with a long straw on it so I should be able to get to most places.
Other than that forums recommend walnut shell blasting