I have had very good results with Meguiars 2 step process cleaner/conditioner. It cleaned my extremely dity mark VIII seats without a problem. Here are the links to the products:
http://www.meguiars.com/store_meguia...-110&store=meg
http://www.meguiars.com/store_meguia...-111&store=meg
Just thought I would share my personal preference.
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