[JohnPercy]

Hello

I'm trying to remove yellow stain on my white shoe sole, i tried with hydrogen peroxide 3% but it doesn't work maybe because its too weak, should i try with 50%? or i need to dilute it to lower percentage. because I'm afraid it will ruin my shoe, it was a gift from my mentor so it's a valuable shoes for me, or maybe do you guys have other alternatives to unyellow white shoes