Which additional option helps cleanse existing duplicate records in Salesforce?

Utilizing an AppExchange solution is a highly effective strategy for cleansing existing duplicate records in Salesforce. The AppExchange offers a variety of third-party applications that are specifically designed to identify, merge, and remove duplicate records efficiently. These tools often come with advanced matching algorithms and user-friendly interfaces, allowing users to perform extensive data cleansing operations with minimal manual effort. Not only do these solutions help in identifying duplicates, but they also provide features for maintaining data integrity and preventing future duplicates from occurring.

In contrast, manually deleting all leads can be time-consuming and may risk losing valuable data. Creating data export schedules is primarily focused on exporting data for backup or analysis purposes, rather than addressing duplicate records. Using an API to manage leads may require significant development effort and may not directly address the duplication issue without specialized logic. Thus, leveraging an AppExchange solution is the most streamlined and effective option for quickly cleansing existing duplicate records in Salesforce.