American Apparel has installed 150 kilowatts of solar panels on their rooftop and have developed a unique cleaning method for panel maintenance. Our guess is that most panel installers wouldn't recommend this method to keep panels clean. As one reader commented in the article, this type of pressure on the panel can cause tiny fractures in the cells. Sliding off the rooftop panels would probably cause large fractures in your bones when using this method.
Details at Huffington Post.