well i use zaino leather products and it is restorative i have found. my leather was beautiful and in good condition but a couple spots had seen more sun than others.

even on the sides of the seats, i found that using a wet sponge with the cleaner product yielded the best results

yeah it's like $20-30 bucks to the door but it works.

if you dont like that idea maybe you should try this... Premium Car Care & Car Detailing Products - Car Wax - Car Polish ? Car Shine - Wheel Cleaners
never used it but someone mentioned before that it's great stuff so i bookmarked it. believe me im all about some soft leather now.