“Spring cleaning” is a code word for shuttering old, unused products, services, and experiments by Google. CEO Larry Page has been doing spring cleaning every once and a while since taking over last year, including big ones in September and November. The latest round came today as they started dumping products that most people didn’t even know existed. Here is a snapshot of the changes: API changes, mostly regarding limiting usage. The Flu Vaccine Finder is gone. Developed in 2009 during the H1N1 pandemic, the need has since passed by. Google Related is a big loss for some. It was useful for those…