Toss in the wash with cold water. Air dry. Boom.
Don't follow the reviews--order your normal size!
"I spent WAY too much time reading the reviews and studying the size chart, which most recommended going at least a half size up due to the style. I did that, and very much regret it--way too big. Not a huge deal if I could exchange, but these were "final sale" and now I have loose, sloppy shoes that I won't wear. Grrrr. . . ."