I found a pair of wipers or "hand cleaners"... they are labeled as "Hamilton Bridge Armored Car Hand Cleaners"...
From pictures I've found, they might work on C15TA's ???
What else?? They appear to be made to clean the "view slits" or whatever you would call them.
I'll put it right out there, I plan on putting these up for sale on Ebay or other, so if you have any problems with that, fire away
thanks!
art k.