FWIW (and thanks Rich @ RedPants.lol for the DIY video) I took advantage of some nice weather to clean the throttle body and replace gasket. My owned from new ‘14 V8 Vantage with 33K miles was showing almost zero residue but I wiped it down and figure I probably won’t be doing that again for many years. Also, I couldn’t get the wired connector unplugged but that did not hinder the job.