I use a diluted bleach solution. I don’t really measure it, but don’t use too much or it will eat your shoes. Let them soak for a few (2-3) hours, then rinse well and put them under a fan to dry them. If you set them out to dry with no fan, they dry slower and get moldy/stinky again.

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Put some baking soda in them , be sure to shake it all around the inside. Let set over night and it should be much better.
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I use a diluted bleach solution. I don’t really measure it, but don’t use too much or it will eat your shoes. Let them soak for a few (2-3) hours, then rinse well and put them under a fan to dry them. If you set them out to dry with no fan, they dry slower and get moldy/stinky again.
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fabric softner sheets work great . my wife puts them in my work boots and deck shoes
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When I was a kid, my mom would put my smelly old tennis shoes (sneakers) in the washing machine.
Best Wishes
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