HOW TO WHITEN SHOE RUBBER

[5] Failing to remove all of the cleaning mixture can leave the rubber looking discolored.
Leaving the detergent mixture on the shoe can also make them very slippery and dangerous.
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Dry the shoe completely. Once you have rinsed all of the soap off of the shoe, use a clean towel to dry the rubber before you wear the shoes again. Once you have the shoe dry, you’ll have a better sense of how well the cleaning mixture did, and you can repeat the process at this point if you need to.[6] Leaving the shoes wet could lead to them beginning to smell.
Wet shoes can be dangerous to wear, so be sure they’re completely dry and free of soap before putting them on.