Remove tables related to old uninstalled djangocms plugins

[Pierric de Laborie]

After deleting orphaned plugin instances, uninstalling the plugins (pip uninstall) and removing their names in the settings,   still remain in the database their related PostgreSQL tables. 

Could someone tell me if there is a command to delete Postgresql tables corresponding to old uninstalled djangocms plugins ?  Should I drop the tables manually one by one?

Thanks