How to "Reset" iCloud Calendar? (a.k.a. delete all calendars)
Each of my iCloud calendar has like 10 duplicates. Each time I try to delete them one by one (which is a pain) they get somehow resynchronized (also when deleting on the web). I'd like to "start fresh", but I don't know how to do that (or how to delete multiple calendars in one time).
MacBook Pro with Retina display, OS X Mavericks (10.9)