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
'14 CLA250 + '04 YZF-R6
'13 Evo GSR, '08 128i, '06 Civic SI, '06 Civic EX, '00 A6 2.8, '97 Civic DX