How can I delete duplicate transactions?

How can I delete duplicate transactions?

I submitted this to Zoho support on February 16th and it's marked to not answer until a week later on the 22nd. 

I want to delete the duplicates not simply exclude them.

I have duplicates, because I had automatic bank feeds turned on (had to make sure this critical functionality was working before migrating to Zoho).
Now when I import my csv's exported from Wave, of course I get some duplicates from the time between when I enabled the bank feeds and when I imported all my transactions.

I need to be able to simply delete duplicates. Ideally before categorizing the valid transactions.