You can manually delete the objects (or the folders containing the objects). deleting the properties may prove more complicated.
To delete the component templates and components easily, you can carete smart groiups based on the date the object was generated/changed or the role which creatd or changed. Once the smart group is populated you can delete the whole group.
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deleting the smart group will not delete the content, it will still exist in the depot/job/ct folders. you can delete the static folders holding the content and it should be fine.