A mistake I made with my Focus was to allow snow to melt on the seats ...Also soon there will be no dust just snow but that doesn't make me happy
The illuminated sills are plastic (albeit chrome plastic) and still scuff - my wife has proved this in her Ct.I have spent the whole summer trying to keep the dust and scuff marks off those places. I just use a dry micro fiber cloth once in a while. I am also getting the illuminated door sills in 2 weeks - not only for the "cool" factor but they are metal and will not show all the dust and scuff marks from when I enter and exit the vehicle.
Also soon there will be no dust just snow but that doesn't make me happy