Need to delete partially reconciled Imported Bank Statement

Hi   A bank Statement Import came though with incorrect data and as there are alot of lines we want to delete this statement and reimport.

Some of the lines in the statement are reconciled and some are not.

All reconcilled items will nee dto be reconcilled again once the new statement is imported.

I just want to check the recommended process and whether to use the archive / purge process or delete the statement manually.

Actions would be:

1.   At the statement header level select 'Unreconcille All' so all lines with in the statement to be deleted are unreconciled

2.  EITHER

     a. run the Archive / Purge process for this bank account and date.    There are other bank statements for that date but not for the same bank account ID so this should work OK