hmm, never thought about ATF. the bolt and carrier were kinda nasty as you know. it's lucas deep clean fuel system cleaner. it says on the bottle that it removes carbon.
used to use kroil overnight and it worked ok. used shooters choice and it worked ok too. tired of buying new chemicals but had some of the fuel system cleaner. it worked very well actually. just mopped the stuff on everything and let it sit about 20 min then wiped it off. didnt think about pictures. sorry. kinda hard to get a picture of black carbon on a black bolt/carrier. don't recall the price being all that horrible either. there is no smell. it melted the carbon off. i'll try some ATF next cause i wont have to buy it. really not a cheap person guys, just tired of buying more stuff to try when i already had some questionable stuff here. if you were my neighbors, id give you all some to try. sure didnt take long at all to get done what i needed.
***original question had lucas fuel injector cleaner but it is actually LUCAS DEEP CLEAN FUEL SYSTEM CLEANER. sorry bout that. its a thick goo like stuff and really clings to the bad stuff. a qtip was all i needed