I picked up my Tundra with 73k on the clock, and at 110 or 120k it developed a wonky idle. It was about due for plugs (so it must have been 110k) so I did them and wiped down the throttle valve. Not sure which was the problem. So far, that's been the only car I've "had" to do that on. Not sure if it's from mostly highway travel and usage of good oils or what, but I just haven't had a problem and as such, don't consider it PM (I guess if I changed vehicles I might wind up with something that needs it).
I did some reading and it sounded like it was best to use a proper cleaner for the job, so I got some... from Walmart. It was only later that I read that you might damage something from moving the flap around, and you might need to do a relearn on the throttle position... neither of which I gave any consideration to. Truck didn't care. YMMV.