[A/S] graphite looking residue in front wrap window

[bobo@xxxxxxxx]

Barbara again,

I have noticed a powdery "graphite" type of residue in the front 
passenger side wrap around window of our "73 Ambassador.  It may be 
what is staining my white curtains too.  I have tried a lot of things 
to get out the spots. Simple Green [usually works on everything