I got my Schneider 90mm super angulon in today. I took it apart to clean and noticed a bunch of creeping crud on the inside glass of the rear element. I bought the lens from ebay and the seller said it had been put on a toyo studio camera and never taken off. I imagine it hadn't been cleaned in a long while.
I assumed that the mechanics of these lenses are the same as most lenses today so I used my usually cleaning method for glass. Folded Pec Pad with 4 drops of Eclipse Optic Cleaner, lightly massage the glass in a circular motion from middle to edge. I did this and I was shocked that the pec pad turned black! Is this something I should be worried about or was it just a huge amount of grime? This only applied to the rear element, the glass on the front element didn't make the pad black, I have a picture below.
I stopped cleaning after one swipe because I was worried maybe there was some sort of coating that I was rubbing off. Should I keep using this method for glass cleaning on these old optics? I'm theorizing that seeming the lens was never taken off the camera that the previous owner only cleaned the front element, leaving all the other exposed elements to collect dirt.
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