How does Arlington cemetery clean headstones?

Arlington National Cemetery employs a careful and respectful process to clean headstones. They typically use a gentle method involving soft brushes and water, sometimes combined with a mild detergent, to avoid damaging the stone. The cleaning is done to preserve the integrity of the headstones while ensuring that they remain legible and respectful to the memory of those interred there. Additionally, they may use specialized techniques for different types of stone to prevent deterioration.