General How to actually delete phone numbers

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http://androidforums.com – I wonder if someone can explain two things to me that are driving me mad. Firstly, how on earth do I actually delete contact numbers from google. I have diligently deleted all duplicate and unwanted phone numbers (about five times now!) so that my call list is showing all numbers in Google while phone contracts and SIM is zero. So far so good, but the phonebook list in my car (picked up by bluetooth) is still showing every number I seem to have ever had, and up to 5 duplicates. It may just be my lack of understanding, and I apologise in advance to Google if it is, but surely deleting a nu (General)