How to clean inside soles of sandals?
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Dove soap and a sponge would work well.
This looks pretty easy and effective: https://m.wikihow.com/Clean-Insoles
I just use a bit of water and dish liquid with a dash of baking soda.
I would use some dawn and water if it can get wet and then let it dry. If there is odor you may need to let baking soda sit in it over night first.