What's the best carpet cleaner for long term stains?

I've got the silver grey carpet, some old coffee like stains are on the floor. "Resolve" does an ok job of lifting the stain, is there anything else out there better?

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Believe it or not a can of good quality brake clean does wonders on stains and grease. Be sure you have plenty of ventilation. Brake clean is tough on the eyes as well so be careful. It will evaporate quickly. Spray some on the spot and wipe with a clean towel. Again, be careful
John

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