All good tips, I hope people read your comment. I had the same Bissell and loved the results as well. My sprayer stopped functioning pretty early on unfortunately so I moved over to the Hoover, otherwise I would still use it.
I have fought this fight many times. When I bought my Corvette, it smelled like a dead hooker. I did some research and managed to find a solid solution that really helps in addition to what was in this article; Star Brite Car Bomb. I made YouTube video about it years ago, and I still use it to this day when needed. Check it out https://youtu.be/v4HQg9O_rKQ