Surely the SingleTrackWorld forum is not the right place to ask that question? This is for bike people.
You’re new here, aren’t you.
You know that black cars show dirt more than white cars?
Well dark/black interiors do too.
I can promise you, while black or very dark grey seats will show stains, very light gray, beige or cream seats will really show stains! I’ve got five years experience of seeing pretty much every colour of car interior there is, and there is no possible way I would ever have a car with a light coloured interior. Imagine getting in wearing a new pair of dark indigo jeans – that blue stain will never come out.
At least if it’s leather there might be a chance of cleaning the surface of most reasonable stains, but cloth, no chance.