Jerry White, a painter with Facilities Management, spends a good portion of the day April 26 "hydroblasting" using a high-pressure water spray to erase a large white happy-face design (looking suspiciously like the Engineers logo), that had been painted onto the bricks of Nobel Plaza. White says the Plaza clean-up is needed a couple of times a year to erase the ground-based graffiti that people believe is painted by overzealous Engineering or Agriculture students.