Here, sorry: https://proconnect.intuit.com/community/help-articles/help/how-do-i-sanitize-a-client-file-in-proser...     

1. Go to your HomeBase.
2. Click on the client you need to sanitize. Hold down the Ctrl key on your keyboard if you need to select multiple clients.
3. Select the File menu at the top left.
4. Click on Client File Maintenance, then select Sanitize...
5. A new window will open when your sanitization is complete. Take note of the Location for sanitized data files displayed here.
   • Note: To open a sanitized file, click File and Open Client, then navigate to the YYSanitize folder shown in step 5. Near the bottom, click on the file type and select All Files.