Bought these Cole Haans from a goodwill. Took them home, cleaned with warm water and dish soap, conditioned with Saphir Renovateur, polished with cream polish. Once they were all cleaned up, I noticed the toe has some lighter shade discoloring. You can see it on left side of the shoe's toe in the picture. I tried massaging some black polish onto that area, but it didn't seem to affect the color. Any thoughts on the cause and how to fix it?