[criageek]

Thanks Greg - I figured I'd give it some air from the air compressor, but don't have high hopes.  I've tried that with the rest of the radio and it really doesn't touch it.  This stuff is from sitting in a humid basement for many years.  I won't touch it with any kind of liquid unless someone can tell me what works without damaging it, but I don't think this stuff is going to come off without some sort of liquid.  I don't know...maybe a soft brush of some sort?  I don't think it's near as bad on the outward surface as the back, since it was protected by the grill cloth, but it still has some grunge on it.

   

Rich

EDIT: Oops...I missed where you said you wouldn't use a brush. But this thing seems REAL sturdy and thick. I probably won't do anything to it unless someone can give me a really sound suggestion. The gunk won't affect the sound...it just looks bad.