Amazon Basics 91% Isopropyl Alcohol First Aid Antiseptic, Unscented, 16 Fl oz, 1-Pack

Rub this on the inside of the shoe with a paper towel. It kills all bacteria easily and evaporates quickly: https://www.amazon.com/Amazon-Basics-Isopropyl-Antiseptic-Unscented/dp/B0CDCW9N37/?th=1