Brooks Addiction Walker V-Strap 2, Men's Size 8 Wide in White

Brooks Addiction Walker V-Strap 2, Men's Size 8 Wide *These are new in box and never worn but there is some discoloration on the soles of the shoes. The discoloration is on the inside on one of the shoes and the outside on the other. Maybe you have an idea of how to remove the discoloration.