Hi @LanceHaverkamp ,
You can delete the contacts, deals, and company records in the portal by going to the table view of each tool and clicking the check box in the top left hand corner of the table (in the header of the table) and then selecting delete. For a tutorial of how to do this, click here. You can delete properties as well, but there is no great bulk way to restore to default in my estimation.
Alternatively, you can start completely fresh by creating a new free CRM. That would be what I would do.
Cheers,