Sidenote: Leather shouldn't look glossy (unless it's treated), it should be a nice matte. This is why it is important to have a two step cleaner and then feeder/conditioner. If the seats are greasy still about an hr after you apply the conditioner then you fed the seat too much so wipe it off (it could also be that it ain't leather - me suspects the middle section of the back seats in the CU2)
Mercedes uses leatherette from C to E class I'm pretty sure but the S class uses real leather.
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