First, never wash leather – it’ll get damaged.
You really need to get it professionally dry cleaned, and the cleaner should re-oil and re-finish it to restore the colour and protect against weather and future stains.
Deal with superficial marks in the future by gently rubbing with a soapy sponge using a pure soapflake solution.
Wipe with a damp cloth and hang to dry away from direct heat.
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