Crotrian Steinweg question

[Phil Bondi]

Hi all.

I have a client with a very nice 110 model. For 
lack of a better word, there is a covering, or 
some type of thin upholstery associated with 
this model. Parts of it are badly stained, and 
she wants to see if it can be rectified. I've 
never seen a piano with this type of material 
before, so I thought I would ask here first.

Thanks,

-Phil Bondi(Fl)