A standard lead report will display both current and converted leads.
Converted leads are unique records that remain in Salesforce for historical reporting purposes. They are not deleted when you delete an account or contact. To exclude converted leads from your report results, use the following advanced filter: Converted equals 0.
To delete converted leads, follow the steps listed below.
Or Mass Deletion of Converted Leads can be done via Dataloader.
- Click on: Setup link | Administration Setup | Data Management | Mass Delete Records.
- Use the following filter criteria: Converted equals 1.
- Select the check box next to the leads you wish to delete.
- Click "Delete".