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Since you don't need too much of either ingredient, start off with 2 tablespoons (30 grams) of baking soda and 2 tablespoons (30mL) of laundry detergent. Stir them together to create a paste. This method works great when you simply need to spruce up the soles of your shoes but don't need to clean the rest of them. Take a toothbrush and dip it into the baking soda and laundry detergent. Scrub it into the soles of the shoes, taking care to get all the sides and the bottoms of the shoes, too. Don't be afraid to really pile the paste onto the soles. You can always make more if you run out, and it won't hurt anything if you use a lot. Once you've scrubbed in the paste, take a sponge and saturate it with cold water. Wring it out so it's not dripping wet, and then start to wipe away the paste from the soles. Scrub away at any areas that are still dirty, and rinse out the sponge as often as you need to. Use a sponge rather than running the shoes under a stream of water. The sponge will keep the rest of the shoe from getting wet, which means you won't have to wait for them to dry after you've cleaned them. Don't forget to dry the bottoms, too, so that you don't slip if you decide to wear them right away. Enjoy your clean shoes! If you notice any sections that are still dirty, you may want to apply a second coat of the baking soda paste to see if that helps lift the remaining dirt.
Mix together equal parts of baking soda and laundry detergent. Apply the mixture to the soles with a clean toothbrush. Wet a sponge with cold water and wipe away the baking soda mixture. Wipe the soles down with a dry towel.