Several dozen more POWs were found in subsequent scouring of the island. A massive search had been conducted, with over 3,000 parties scouring the countryside. Sand or pumice may be added to produce a scouring soap. An initial scouring with hot soapy water will usually remove the protective coating. Later, more thorough techniques of scouring the surface irretrievably lost the earlier text. Glaciers erode predominantly by three different processes&colon; abrasion/scouring, plucking, and ice thrusting. Lake deposits formed by glaciation, including deep glacial scouring, are abundant. Substantial damage occurred in areas untouched by fire, including signs of ground scouring. Icecaps expanded, scouring the land of life and reshaping its topography. This can reduce the wave reflection which often contributes to beach scouring. However, the scouring of major floods, and other factors, affect this. Irving left for Madrid and enthusiastically began scouring the Spanish archives for colorful material. This culminated in a cadre of archaeologists, scientists, cartographers and engineers scouring northern Egypt. Deep ground scouring was observed near the town of Sedgewickville as well. This made it possible to do without the use of a scouring stick.