:twocents: BBM to address individually....
:twocents: The smell WILL SEEM to become worse while contained within an enclosed/sealed vessel and once a "wind flow" (as in opening the trunk or door) is established WILL "engulf" the senses (yep, nose gets it but your eyes water too and there's frequently a major desire to vomit!:sick

on impact of the "new wind flow" direction. Did it "worsen" over the 18 days within that incubator car.......OH YEAH! (IMHO :innocent
:twocents: Regarding a "peak" in the smell factor: The smell is pervasive BUT will be minimized (tho not by much!:sick

as the body/fluids/contaminated materials are removed or decontaminated so as with most "things in life" removal of the causative agent diminishes the "end products". Here's where Dr. Vass' wisdom/experience/data will be best utilized in the future as needed to identify PMI (post mortem interval/indication) but that's part of the Oak Ridge/Body Farm research.
:twocents: Add our "good friends", virus & fungi families to that third statement and you've got it!:seeya: For all the efforts :crazy: put into cleaning the Sunbird, the living, invisible microbes are the "gang" that did the felon in!:woohoo: Without elaboration, the "critters" had a marvelous Summer vacation within that enclosed vehicle and all the FRESH, CONCENTRATED efforts of the "A"-team in trying to modify the scene (notice I :innocent: did NOT say obstruct/obliterate/obscure/minimize evidence!:great

only served to DIFFUSE & DILUTE the odor, temporarily.:banghead::banghead:
There isn't a Yankee Candle spray/candle/tart created YET that is called "masque du mort"!:floorlaugh::floorlaugh: