Cleaning Interior

Have had my EOS for about 6 months now. It is Wheat Beige with Cornsilk Leatherette interior. The interior is really hard to clean, especially where anything greasy or oily gets on it. Has anyone found any good products for cleaning-up spots like these? The worst is the arm rest between the front seats. If gets dirty from just resting my arm on it while driving. I've tried a couple of leather/vinyl cleaners and just plain dishwashing soap and water with only limited success. Thanks