How to Bulk delete orders

[Stingraynut]

I have 14973 orders dating back to 2011 and I want to delete all of the 2011 and 2013 orders
There are far too many to do one by one in Admin.
I've read this post http://forum.virtuemart.net/index.php?topic=107570.0
I don't know how to remove orders with those dates from the database, is there a script I could use ?
or another way to bulk delete old orders?

Rob