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AWESOME – KUDOS to this guy !!
‘Readers Digest’ version and info is condensed but if anyone has an interest in doing this
GET PERMISSION FIRST, attend a cleaning course to learn the proper way, do no harm – the wrong cleaner and practices will cause permanent damage. No bleach and no power washers!
Most of the time a soft bristle brush and water will work and then you will need a cleaner called ‘D/2’ .
Research the National Park Service National Center for Preservation Technology and Training
https://www.ncptt.nps.gov/