Cleaning Sonus Faber speakers

I own a pair of Sonus Faber Grand Piano Home speakers.
I would like to clean the speaker covers the glossy black sides and the leather top that this speaker comes with.
Would anyone who owns a pair of these tell me the best way to do this without causing any damage to anything?
Thanks for your help in advance.
I suggest you call directly Sumiko Audio at 510-843-4500. They are best qualified to answer question on Sonus Faber, as they are the US importers of the line.
Thank You Guidocorona! I think I will do this.

As an ex-New Yorker I Love the name dude!!!!!