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Remove dirt with a toothbrush. Clean the soles with baking soda. Put the shoes in the wash. Dry the canvas shoes in the sun.
Make sure to use an old, dry toothbrush. Use the toothbrush to scrub all of the canvas shoe. Try to get off any loose dirt debris. Pour baking soda and water in a bowl to create a paste. Dip the toothbrush in the paste. Scrub the shoes until stains begin to lighten. Then, wipe them off with a damp cloth. Turn the washing machine to a gentle cycle using cold water. Pour a gentle detergent into the washing machine when it is halfway filled with water. Put the shoes into the washing machine when it is three-quarters of the way filled with water. Allow the shoes to air dry. Preferably, put the shoes outside in the sun. This will allow the shoes to dry in the best condition possible.