RE: Whats the best way
I took Sandy's word for it and used Lemon Pledge on my interior. Stuff worked fantastic. Nice and clean, no grimy feeling, not too shiny for the dashboard (you'll regret using armor-all on the dash the first time you drive on a sunny day), and it leaves the car smelling lemony-fresh.
I have to get to cleaning my car up for chicago too. I have to give it a good wax job.