Musical Fidelity - Silver finish faceplates

Hi guys
I have had several Musical Fidelity amps over the years and i have found that the silver face plates from the Kw series onwards seem to mark very easily , i am not talking about obvious miss treatment by knocking it on a rack , just small scratches as if done by running a say dry folded tissue to dust off . Maybe they need a silk cloth ? , has anyone else noticed there unit be it Kw ,X series, and A5 series displaying this ? I have a Kw 500 that in certain light shows a small scratch , flick on the lounge room light and it can not be seen as if it is not there at all. Never seen this with any other brands i have owned.
I Really like Musical Fidelity amps but they just seem to mark easily. Cheers.