I took my sick (cancer) dad crabbing once and had turkey necks in a five gallon bucket. Accidentally left the bucket in the back floorboard of my crewcab F250. Had a company car so didn't drive my truck for about 5 days.
Oh My that was THE worst smell ever. I cleaned leather seats, shampoo'd carpet and still had to leave windows open for about a week. Odor finally went away.