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I think the everyday item you are thinking about is a mixture of some sort of citric acid(lemon or grapefruit juice), along with another sanitizing ingredient, such as alcohol, baking soda, and the like. Hope it helps.
For what it's worth, I own white tennis shoes and I am too lazy to clean them at all, and I somewhat like the gruff appeal of shoes that look lie they've gotten around.
I'll try some the afore-mentioned items and report back on any significant gains.
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