What I do is first select a new query and place my "selection info" in the fields that I want to flag for deletion. Run the query.
Then I look at the answer.db table to see if it is correct.
Then I select "Delete" from the far left section of the query, UnCheck ALL fields but leave my "selection info" and run the Delete Query.
Then, before I do anything else I look in the :PRIV: folder for the Deleted.db and see if it is correct. If it is not then I use "Tools" "Copy" "Deleted" and point to the original table and replace the deleted data back to it's original table and start over again.