Can I Mass Delete Duplicate Records (Accounts)

Hello,

When I had imported from another CRM about a year ago, I had imported A LOT of EXACT duplicate accounts and have over 12,000 records (reason for so many duplicates was I imported my "contacts" to my accounts and I had multiple contacts per account).

I see the way to "find/merge duplicate" but that is a one by one process.

Is there a way to mass delete or a duplicate record look-up and then delete?

Would greatly appreciate any help you could provide.

Thanks,

Matt