I have a Mercedes Benz C 180 bought from local agent three years back brand new done only 25000km. in that car door unlock button & AC buttons which are with sings started fading & peeling off when touched leaving no sings indicating except a ugly white patch. when i inquired about it from the local agent they informed me it's usual for these vehicles.but I'm a user of two other vehicles such as Toyota & BMW i never came across this kind of thing.so i think Mercedes is using very poor quality paint materiel for buttons on dashboard & side doors.i think this needs to be corrected.