Intake valve cleaners

[Breachbolt1290]

Hello all,
I have a '12 rogue w/ 30k. I was wondering if anyone has used any intake valve cleaners? If so, which ones and where did you spray into after the maf? I've stumbled upon the CRC spray and looking for inputs/experiences. I am strictly doing this for preventative maintenance.
Thanks for your time.

[dave08902]

I treated my 2010 Rogue at 90K. Before I did the treatment, I took pictures of the cylinders and valves using a boroscope. The number one cylinder was extremely coated with burnt oil that I could not read the numbers on cylinder head and the center concave was full. I injected the CRC intake valve cleaner into the resonator intake after the sensor. After the treatment I added 2 bottles of injector cleaner to the gas tank. A week, I took another set of pictures and all cylinders and valves were perfectly clean. The valves had shinny metallic look like they were bead blasted. The power increased and fuel mileage went up.

[amc49]

Any deposit that came off that easy was NOT burned on to be solid.

I sold tons of those products and as well have built hundreds of engines to fully know how bad those deposits can be to clean off. You need a chisel in some cases.