This is not a how to video but instead some thoughts to consider before cleaning. David is a professional Gravestone Carver, and endorses a more "hands off approach" as much as possible to preserve the sharpness of the carvings and letters.
"A Graveyard Preservation Primer" by Lynette Strangstad https://www.amazon.com/Graveyard-Preservation-American-Association-History/dp/0759122423
See our Website at www.pumpkintownprimitives.com
Like us on Facebook at https://www.facebook.com/pumpkintownprimitives