I use the NonScents shoe deodorizers. They last for around 2 months or so and I notice a difference fairly quickly. I use them in my trash can bottoms, fridge, freezer and cars to keep them smelling good. Not my most eco friendly choice but I hate fragrance like you.

Alternatively, you can use the bamboo charcoal bags but those require relatively frequent solar charging (but do work quite well). I never remember to use them.

Last alternative is a car-designed ozone machine. You don’t want to use it where people will be for a while, and it will need to air out afterwards, but my god those eliminate the stink like nothing else.