A new documentation is available for Squash TM 2.0 and later versions, check it here
The cleaning icon (on the left) allows to launch the process of deletion of all automated suites and automated executions whose execution date make them older than the conservation duration programmed in the project configuration page. All suites and automated executions whose execution date make them younger than the conservation duration set in the project configuration page shall be kept.
This deletion affects both automated suites launched from Squash TM and automated suites launched from a pipeline CI/CD.
WARNING
this operation may delete a very large number of suites and automated executions. The application may be temporarily slowed down by this. It is preferable to run this operation when the application isn't used.