I do automotive detailing on many high end exotics... I would not recommend any product like windex of dirttex stay away from them they will ruin leather. I would an interior clean such as interior one. Use it one a small leather section to see if it will change the color id=f not that should remove it. If you dont feel comfortable with that try a an armoral leather protectant. It should be able to remove the gum....best of luck!!!
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