Here are the steps to clear out the Potential Duplicate table.
1. Open the data loader and choose Export
2. Choose the Salesforce Object Potential Duplicates
3. Choose ID
4. and Finish.
5. Then save that file as a CSV
6. Go back in the Data Loader and choose delete
7. Choose the Salesforce Object Potential Duplicates
8. Browse for that csv
9. Map to members id and finish