The alloy leather seats and light interior are some of the major reasons why we bought the vehicle we did. We had black seats in or T&C and when it gets to 110 here they're way too hot to even sit in. We wound up putting light-colored cloth seat covers over our black leather seats and they looked like crap, but at least we could get into them without burning our tushes. As far as keeping the alloy seats clean, there's just the two of us and so we don't have to worry about kids and pets messing things up. I did notice that after 5000 miles, the driver seat is showing a bit of dirt, but not bad enough to take any cleaners to it.
Oh, one thing that I remember, before we put the seat covers on our T&C seats, they showed the light-color dust and dirt, and took as much effort to keep clean as any light seats would.