April 18, 2013, 1:01 PM — Here's how you can remove all app data from iCloud via OS X.
1. Go to System Preferences.
2. Go to iCloud.
3. Go to Manage.
4. Select the app.
5. Tap on Delete All to remove all data for that app.
For more, see the original article at the link below.
Delete App Data from iCloud via Mac OS X | OS X Daily