I heard mention of a brush up above. I'll bet that the shoe shine brush "a new one" would work well on the seats, they are pretty soft, but firm enough. Although all I've used the last 10 years or so has been microfiber.
'13 TiAg over Coral, 335is | DCT | Prem | L7 | Nav/Idrive | CA | 19" "-------"
A BMW is Just a Car, it doesn't make you smart, handsome, cool, or wealthy. Get over it.