clear email Account content

Having manually created some 40 accounts

I tried importing PST files - only some of these completed without errors

are there any powershell commands I can use to EMPTY these account contents

I think need to use Outlook to import the PST - seems to be more reliable.
(I have previously imported via PST without issues.. just a bit long winded)

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What about doing something simple like this:

1. Dismount the database
2. Delete the EDB and LOG files
3. Mount Database

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Alternatively, is there a way to export the account details to CSV, delete all accounts and then import the accounts via CSV ?