Wipe them down, that's all they need. Unlike our sneakers, the clogs aren't machine washable: the footbed and midsole are bonded in layers, and a wash cycle or a long soak breaks them down.
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A damp cloth with a little mild soap lifts most marks off the Flyknit.
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Take the insole out and wipe it separately.
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They're fine to get wet, just don't submerge them. Let them air dry away from direct heat or a radiator.