Cleaning is the most common treatment for historic grave markers. Before attempting a cleaning project, it is important to determine the type of stone and the nature of the soiling. There is an abundance of commercial or proprietary products available for cleaning specific types of soiling on different types of stones. Cleaning of a historic grave marker should begin with the gentlest methods and procedures. If a conservator is involved in the project, he/she should be involved in selecting a cleaning method and/or product appropriate for the type of stone that is to be cleaned, based on its current condition. Onsite testing of selected products should be performed to ensure that the appropriate product is being used. A conservator can also assist in identifying which stones can be safely cleaned and those that require stabilization before cleaning can be implemented.

Volunteer Cleaning a headstone
Cleaning a headstone

Monument before cleaning  Monument after cleaning
Monument before and after cleaning