High Pressure Cleaning was developed in order to remove a thin surface layer from some material, thus lending itself well to the removal of graffiti. A pressurized mixture of air/sand or water/sand is used to blast off the surface of the vandalized area.
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... and Krusenstern (1805). Both, however, regarded it as a peninsula, and were unaware of the existence of the Strait of Tartary, which was discovered in 1809 by a Japanese, ...