When Brian Davis walks up to the tombstone of Thomas Barber, who died in 1886 at the age of 85, he knows the simple devices in his hands will make a difference. Barber's stone tablet features a cross near the top and is covered with dirt, lichens and mold in its spot near the treeline.

Davis sprays all sides with water, scrapes off the lichens with a broad Popsicle stick and rubs on the flat surfaces of the stone with a natural-bristle brush. "This is just water and a brush," he emphasizes, as significant dirt is removed.

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