Toss in the wash with cold water. Air dry. Boom.
Mega Uncomfortable
"I own two pairs of Rothy’s, including the Driving Loafer, which I really like. Unfortunately, these were a completely different experience. They felt fine when I first put them on, but after about 20 minutes of walking they became extremely uncomfortable and started rubbing badly. I would absolutely expect them to cause blisters with any extended wear."