Getting to the throttle body in my car seemed like a bit much, so I tried spraying it past the MAF with the intake box removed as the straw seemed plenty long enough.
There was a right angle bend in the air path just past the MAF and I think that screwed me, as my car ran like absolute garbage after the CRC cleaner until I removed the MAF and cleaned it. I think the spray was reflected some by the bend and ended up splashing on the MAF.
I also suspect that the cleaner pooled up at some point, after my one hour cool down I went up my steep driveway to head out and drive it like I stole it. My car started hesitating near the top and then nearly stalled twice once I hit the street, with a loud sound like marbles being thrown in a coffee can each time...I think I'm pretty like my car didn't get damaged at that point. All I could think was that some cleaner ended up pouring down when I went up the steep incline.
This stuff is probably great if you can get to your throttle body or have a different intake/MAF configuration than mine.
I do intake valve cleaning through a vacuum line with a special tool and cleaners from Subaru now and that has gone a lot better, although there was a bit of a learning curve for me the first time I did it that way, too.
