My family is doing food business, did some deliver with our latio every morning. Had many cars before this since 10+ years ago.
Every car we had will have some sort of after smell since we deliver food in the morning, together with the sweat smell. It's very hard to get rid, keep buying air freshener, put pandan leaves, wind down windows for few minutes whenever I drive. All who sit in our car will comment.
Now with latio, we never had the after smell anymore. Not a slight smell. The ionizer is definitely working very well. Tested and proven with real life examples.
I don't see why another ionizer is needed.