Those giant cinema screens are total germ-bait. It's a business model just waiting to happen. And Michael Quaranto, of Houston's 1570 Cinema Services, capitalised on it big time. The airline pilot got together with his best mate, Andrew Brown, and on their 14 days off a month, they travel around the country and clean IMAX screens. "Theatres that carry concessions often have Gummi bears or soda thrown at the screen. We also find spit wads," Quaranto told Fortune. "The biggest problem is that they get dusty. The most dust we've ever seen was a quarter-inch thick. "We usually have to empty the vacuum cleaner at least two or three times during the process. We're covered in dust by the end of the night". So next time you go to the movies, make sure you take a good look at that super-clean screen.