Cleaning tough stains from leather...

I have some old leather seats that somehow got light tire treads on them while sitting in storage. Anyone know some tricks to get these things clean? So far nothing I've googled has given me anything that helps. Thanks for your help.
Dave
 
I have some old leather seats that somehow got light tire treads on them while sitting in storage. Anyone know some tricks to get these things clean? So far nothing I've googled has given me anything that helps. Thanks for your help.
Dave

Meguair's Leather Cleaner and Conditioner, works wonders... check AutoZone or Wal-Mart

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Some tuff stuff with a soft bristled brush followed up with some conditioner. I like Surf City leather conditioner better than the meguiars and mothers I've used in the past.