Delete duplicate contacts from Address Book on Mountain Lion with iCloud

AddressBook Cleaner's users ask us for a solution to remove duplicate contacts from Apple Address Book on Lion and Mountain Lion with iCloud. Since it's a very common problem for users who have upgraded to Lion and used iCloud to keep contacts. The following is a quick step by step guide to finish removal of contact duplicates in such situation:

There are 2 steps to delete duplicates from iCloud:

I. Get full copy of contacts on local computer

• First, go to System Preferences by clicking  -> System Preferences..., then choose iCloud, it will appear like
  
  
  

  Uncheck the "Contacts" surrounded by red line to disable sync Address Book with iCloud, then there will be a message ask for dealing with local contacts.

• Choose "Keep Contacts" to leave contacts on local computer

  
  

• Re-enable sync Address Book with iCloud by clicking checkbox

  

• This time, choose "Merge" to combine contacts from iCloud to make sure we have full copy of contacts.

  

• Disable iCloud again as step 2
• Delete duplicates by using AddressBook Cleaner
• Now, we have all the contacts on local computer. Repeat steps above to confirm that we have clear copy of contacts on all computers.

II. Update iCloud Contacts

• Once we have finished getting full copy of contacts on computers, sign in iCloud
• Choose "Contacts"

  

• Delete all contacts in iCloud

  You'd better made a backup by "Export vCard..." before perform the deletion.

  Show the action menu by clicking the button at bottom left corner of the iCloud page.

  
• Enable iCloud "Contacts" on your computer (the computer you've done the cleanup in Part I) to update iCloud from local copy of contacts.
• Done!

  Wait until the update process finishes in step 4. Check to confirm that you have every contact in iCloud "Contacts" as local computer.