Hi. My system drive is almost full - - about 150gb are in the two Library folders (root/library, user/library). This is a Mac Pro that I have been using for 6 years since Leopard, never clean installing, always upgrading. There has to be some stuff I can get rid of. Is there any way to clean up of these folders? I would like to only clean install as a last resort, this is a production machine that I need for my work. Thanks!