ALBUQUERQUE, NEW MEXICO—Trash, motorcycle tracks, and graffiti were discovered at Boca Negra Arroyo in the Petroglyph National Monument. The fencing was down, semi-trailer tires had been dumped in the canyon, traces of campfires were found, and an archaeologically sensitive dry cave had been spray-painted with graffiti. “We have to be careful and sensitive so we don’t damage the rocks and create our own markings. We have a variety of methods to try, ranging from high-pressure water, to a pumice removal method to a new product, an environmentally friendly solvent. In the very near future, we’ll have it looking better,” Dennis Vásquez, the National Park Service superintendent at the Petroglyph National Monument, told The Associated Press.