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SQL Workload Analysis has an SWACleanup app that is located in the installation path:

C:\Program Files\Idera\IDERA SQL Workload Analysis\bin

SQL Workload Analysis 1.7.x > SQL Workload Analysis Cleanup App > SWACleanup.jpg

Once you run it by double clicking SWACleanupApp, a SWACleanupAppLog file is generated.