Toss in the wash with cold water. Air dry. Boom.
Didn’t last two weeks
"While they are comfortable, they didn’t last a two week trip. The rope trim around the shoes is not durable at all and scuffed through to where you can see Rothy’s Blue thread in the center. I do not recommend for any length of walking. Worn out looking after two weeks , so these are now “house shoes” only. Also have minimal arch support. Definitely not worth the price."