The tests that had been run took place in a district were some insulators were being washed, whereas others were not. After light rain and fog, 57 pole tops had caught on fire along with 12 circuit interruptions in the unwashed section. On the contrary, no issues whatsoever occurred on the washed insulators. The effect of adding other materials in water for washing was a test subject. An abrasive material (Grand Monterrey Sand) had been added to to a water stream. Effectively speaking, this abrasive material had been found to make no difference in washing contaminated insulators. Instead, the abrasive material posed a threat for clogging up the nozzle, thus disrupting the flow of water. Unfortunately, when put against cement and petroleum based materials, water had only been effective to a certain degree.