You can obtain a list of all defined extended properties by querying
sys.extended_properties catalog view and insert that into a cursor as you seem to want to do. (Please read the description of each column contained in sys.extended_properties), armed with that information you should be able to write the necessary T-SQL to perform the deletion using sp_dropextendedproperty
If everything seems to be going well, you have obviously overlooked something.
Ron
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