Some vehicles need this every 30,000 miles or so and that can get expensive.
I think the method with the CRC is fine if you don't let it get to this point. I know we have been spraying this stuff in the Veloster every oil change far before the 60,000km or so when the valves would normally be caked to this level and it has been fine since the original dealer valve cleaning under warranty. It has over 200,000km on it now with the original catalytic.
PM is the key here.
This video is more so to show it works even on heavy duty carbon deposits like this.