iCal Cleaner is a free Mac application that was designed to help you easily remove useless data like duplicated or blank events and alarms from iCal with very little effort. This tool can come in handy, especially if iCal is running slow due to the fact that your calendar is filled with unnecessary or past events or appointments.
Using the iCal Cleaner is very easy and all it takes are just a few clicks of a mouse. After launching this application you will be greeted by a simple and intuitive interface from where you can quickly select which items you want to delete (duplicated events, blank events, alarms, etc.) as well as the calendar (or all calendars) from where you want them to be deleted.
Other than that, when using the iCal Cleaner you won't have to deal with any complicated menus or settings, keeping the job of cleaning the iCal simple and straight to the point.
To sum it all up, iCal Cleaner is a free Mac application that is worth trying if you want to make iCal run smoothly by removing any unnecessary data that you might have stored.