Toss in the wash with cold water. Air dry. Boom.
Buyer Beware!
"These shoes were NOT designed for kids. My daughter wore these shoes to school for 2 days, not even 2 days in a row, and the stretchable strap that goes across the foot was significantly frayed and loose. So much so, that I’ve had to take them to a shoe repair shop to see if they can replace the strap so they are actually wearable again! I’m only glad that I bought them on sale instead of paying full price because, clearly, they are NOT worth these high prices. Roth designers, please go test out your shoes on some kids before trying to sell them at these elevated prices, only to last a total of 2 school days. I wish they would let me submit a picture. Just terrible!"