Book cleaning machine.
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Previously:
https://www.homemadetools.net/forum/...506#post200954
https://www.homemadetools.net/forum/...818#post186712
https://www.homemadetools.net/forum/...933#post124846
https://www.homemadetools.net/forum/...565#post139438
https://www.homemadetools.net/forum/...921#post148752