Going to post this in both threads on the topic in hopes it helps someone...
I just sold my 2018 back to a dealer here in SC yesterday...smell was back/as bad as ever. None of the stop-gap fixes ever worked for more than 1-2 days. I had complained mightily for years, and opened a case with Ford about this and transmission issues in April. Finally, after this step and making them drive it after being out in the sun, etc., my dealer acknowledged the problem, and recommended to Ford that they replace the evaporator, coils, and some tubing on mine, under the (expired) original warranty. Ford originally agreed, then the ESP Warranty came in and denied, due to an "odors" exclusion. I fought with Ford, saying it was a design/system defect causing the odor, and that the odor was simply the result of the defect, not the defect itself. Ford eventually offered to go 75-25 directly with me on the repair, which was roughly $2k, so I would have paid about $500. They gave me 30 days to accept or re-open the case. I was going to fight with the ESP folks over their incorrect warranty denial, but then decided to just sell the truck back and move on.
I loved my Raptor 97% of the time, but the AC smell, the cam phasers, and the ongoing transmission issues finally led me to take the money in this distorted market. For those of you who have this issue, you CAN get some help from Ford, if you stay after it. Good luck.