HOW TO WHITEN SHOE RUBBER

Remove any caked-on dirt. If your shoes are particularly dirty, you may want to start by taking them outside and slapping them together to knock loose any large bits of dirt or mud. If you leave too much mud on the shoe, it will take a lot longer to get them clean.
Make sure to slap the shoes together outdoors so you don’t make a mess inside your house.
You may even want to use a butter knife or key to scrape set mud out of grooves in the shoe.

Use a dry brush to remove loose dirt. Before you begin scrubbing away at the rubber parts of your shoes, start by brushing or even scraping off any loose dirt that’s stuck to it. The more you remove with a dry brush, the less mess you’ll have to deal with once you create your cleaning solution.[1] Don’t worry about scrubbing too much, if the dirt doesn’t come free quickly, it will once you begin using the cleaning solution.
Use a dry brush like a toothbrush, but avoid steel bristle brushes that may damage the rubber soles of your shoes.

Mix one part baking soda and one part laundry detergent. Depending on how much you need to clean, you likely won’t need much baking soda or laundry detergent. Begin by mixing a tablespoon of each in a small bowl thoroughly. You can always add more of each ingredient if you find you haven’t made enough.[2] The baking soda will act as an abrasive to help the soap remove dirt and grime.
Avoid using laundry detergents with bleaching agents.

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