Short answer: Clean leather gently, keep water exposure minimal, and condition it occasionally so it does not dry out.
- For light dirt: wipe with a soft, slightly damp microfiber cloth.
- For spots: test any cleaner on an inside area first, then use a leather-safe cleaner.
- Drying: air-dry at room temperature, away from heat or direct sunlight.
- Conditioning: apply a leather conditioner every few months if the jacket feels dry.
- Storage: use a wide hanger and keep it in a breathable cover, not plastic.
Tip: If the jacket is suede, use a suede brush and avoid liquid cleaners.
If you share your jacket material and where you plan to wear it, I can suggest a safer option.