The best is a high pressure spray. They used to sell a nozzle for a typical garden hose. But any high pressure water stream will work. Dr. Bronners can help too. Depends on if you have the cotton or straight rubber top.
Hmm ok. I have the cotton canvas version. Thanks!
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Japan you get the Marugo versions :)
Tabi shoes
https://www.marugo.ne.jp/en/