Albuquerque uses 'elephant snot' to clean defaced petroglyphs Petroglyphs are valuable relics of a past age – rock carvings that are produced by chiseling directly into a rock’s surface. That being said, archaeologists and conservationists alike are dismayed when these carvings are defaced by graffiti. What is the best way to clean up the mess? The answer surprisingly is a product named “elephant snot.”
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