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OK. I rubbed it gently with the first one and it just crumbled. So, tried the second eraser. It stayed together but really didn't do anything. I guess it must be something different, but thanks for...

So - I picked up some magic erasers (Mr. Clean). Do you really wet it first? Or is there some other magic eraser?

Thanks. I'll have to pick some up. I just don't think I can get myself to sand a book block...
I'll let you know how it works.

I'm not sure if this is where this should go, but it's the best match I could find.

As I've been cleaning, Demco-ing and packing books I've found several with this problem:
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