NCPTT study recommends D/2 for cleaning government headstones

Photo credit: NCPTT/NPS

Researchers studied five different cleaners on stones located in five different climates at locations across the United States. Microbiologists at Harvard University evaluated samples for regrowth of microorganisms including bacteria, fungi, and algae. D/2's quaternary ammonium solution came out on top!

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Read more at https://ncptt.nps.gov/blog/best-practice-recommendations-for-cleaning-government-issued-marble-headstones/