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After all the spine linings that could be removed dry, I moved on to a wet cleaning process.
The text block was placed in working boards and clamped in my backing press with just the spine area above the cheeks. A thick paste was applied to the spine to soften up the mull and old adhesive. To keep the paste moist I covered the whole area in cling-film and waited for about 10 minutes before removing the paste and any mull and adhesive that had become soft. I then repeated the process until the whole of the spine area was as clean as I could make it.
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Care must be taken, as the paper becomes soft and can be damaged, even more in the case of this particular book. The sections are in fact just a single fold (Folio).....not fun!
What became more evident as the spine became visible was the shocking rounding and backing.
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Sections had been crushed, threads broken, old crusty hot glue... not nice. I imagine that this poor book was rounded and backed last thing on a Friday afternoon or after a particularly good lunch.