I have no idea how to clean it. It might have a bit of a basement odor as well, I don't know.
I think this is about 15 long, that seems likely. This has moderate wear overall and was clearly well-loved.
I rescued this from an estate basement because I felt bad for it and wanted it to have a good home. Maybe you could give it that home? If you have any questions, please ask. I have lots of vintage electronics listed--feel free to take a look!