Freezing Boots in a plastic bag to kill off the bacteria that cause the smell

Frugal tip for anyone with smelly boots or shoes, placing them for 24+ hours in an airtight plastic bag in the freezer works wonders, does minimal to no damage, and costs nearly zero dollars to implement. I was at the end of my wits with how quickly my boots started to smell at the beginning of each day, but this trick really worked! And I'm treating it like anti-biotics: not stopping just because the problem seems solved lest there be cold-resistant strains that survive to reproduce and take over the boots. Every night from now on, I'm freezing those pesky microbes to death so they don't come back. Hope this helps others!