Address stains immediately for best results. For oil or grease, blot (don’t rub) with a clean cloth, then sprinkle cornstarch on the stain and let sit overnight to absorb oil. For water spots, lightly dampen the entire panel to prevent rings. For ink, try dabbing with a cotton swab barely moistened with rubbing alcohol, but test in an inconspicuous spot first as alcohol can damage finish. For significant or stubborn stains, professional leather cleaning is recommended rather than aggressive home treatment.