When historic cemeteries are overgrown it can be hard to know where to begin. To ensure work is positive and doesn't inadvertently cause damage, begin by recording what is there. Then move slowly through the clean up process, using various resources to learn the best practices for preservation.
Caring people are often fooled by the seemingly strong materials that form cemetery markers, monuments and structures. Marble, granite, concrete and other materials are quite sensitive and should be treated with great care. Monuments and markers should be only cleaned every four to five years, following recommended guidelines.