During my tests to port several databases to SQL Azure, one of the recurring things that fails export is the Extended Properties. So I just wanted to remove them.
This is a simple wayh to list all Extended Properties and the corresponding delete statement.

SELECT 'EXEC sp_dropextendedproperty @name = ' + QUOTENAME(ep.name, '''') + ', @level0type = ''schema'', @level0name = ''dbo''' + ', @level1type = ''table'', @level1name = ' + QUOTENAME(OBJECT_NAME(c.[object_id]), '''') + ', @level2type = ''column'', @level2name = ' + QUOTENAME(c.name, '''') + ';' FROM sys.extended_properties AS ep INNER JOIN sys.columns AS c ON c.[object_id] = ep.major_id AND c.column_id = ep.minor_id

 

http://weblogs.sqlteam.com/peterl/archive/2012/05/27/remove-all-extended-properties-in-a-database.aspx