Part 1 – In a monument at Washington, it was found that erosion levels were high and something was supposed to be done soon to prevent further dilapidation of the building. On observing closely, it was found that a strong chemical was being used to clean the building roof. The use of this cleaning chemical was leading to rapid erosion. by Vishwadeep Khatri | Jul 14, 2014YES 70% 14 YES or NO 30% 6...