How to Remove the Smell of Cat Urine from Running Shoes

Find a plastic bag large enough to fit the shoes. It will also need to have enough space to tie up once the shoes are inside.

Place a handful of baking soda into the plastic bag.

Place the offending shoes into the plastic bag.

Tie the bag up. Shake vigorously to get the baking soda all over the shoes.

Leave the shoes in the bag for the next 5 days. Longer than this is fine too.

Remove the shoes outside or somewhere that you can shake them, like the bathroom. Shake the baking soda off the shoes completely.

Place the shoes in the sunshine for a day. The sunshine is important, so if it's too cold or raining, place them in a windowsill for the day or more.