2 Deep-clean them
Apply a few drops of Jason Markk Premium Shoe Cleaner to a wet shoe brush, shake off and then scrub gently all over to a foam. Use a toothbrush for hard to get to places or for more delicate areas such as mesh or suede patches. Wipe off with a towel and repeat all over. With canvas shoes, dab and twist with the towel to help lift the stain and dry the canvas.