i clean the dashboard with just a wet microfiber. It pickes up everything in the little dimples of the dash. I don't use any products such as armor all (worst!) or meguiars (best!) i just get rid of the dust. As for the door panel inserts and the seats, i recommend u go get a can of 3m scotchguard protector so it doesn't get dirty in the first place. link below:
http://solutions.3m.com/wps/portal/3...ery_Protector/
Now all i do is take my clean wet microfiber and wipe the door panel cloth to make it clean again b/c it doesn't get dirty.