my old 128i had taupe leatherette, no sport seats. i would wipe it down now and then, but honestly, not very often. it held up great - i even used to park outside in the sun 24/7.
i did have to watch what jeans i would wear. dark jeans + light colored seats = no go
'13 BMW 135is 6MT #509/586
'15 Mini Cooper 6AT