I've got a obsidian F Sport with Cabernet interior and trying to keep that "new car" look. The dark carpet needs constant vacuuming (bought a Metropolitan and love it) and the shinny plastic needs constant dusting. I'm using a Swiffer at least a couple times a week. Just tried Plexus plastic cleaner and it works well. Not sure how long I can keep it up, but enjoy trying to keep that just new look as long as possible.

 

If you get into a rhythm its not that hard. I use one of these for dust:


For the gloss trim/wood, etc. You can use just a plus microfiber after dusting to wipe any fingerprints off.