Easy Way to Find Duplicates

Good day all.  Is there an easy way to identify all of the duplicates in an ItemType?  I am trying to move our parts into the OOTB Part ItemType.  During the process I discovered that I created duplicate entries.  I need to go through and remove them.  The only way I know how is to run a search on the parts, put it into an Excel document, filter all of the duplicates, look them up, and then delete the duplicates.  Thanks for the help.