Nubuck Leather

I used a foot locker Instant Sneaker cleaner in my yellow Timberland boots. Now it remains to this dark stain.

What should I do, to get rid of the stain. It says, and nylon fabric with smooth leather and vinyl is not Suede or Nubuck.

Unfortunately, the material for Timberland Boots Are Suede. Sorry brother, but the stain permanently.

White Mountain Patent & Nubuck Leather Cross Band Sandals

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