Hello and welcome to the forums,
If you really want to delete those records permanently, you'll have to do this directly with SQL query. Tables containing the data are named *_data_1. You'll also have to delete referencing records in *_edit_history_data, *_edit_history and *_recent.
If you want to wipe the data completely, removing all records, you can also reinstall selected module.
With that said, it's really not necessary to delete these records permanently. They have absolutely no impact on functional part of the system and only a small impact on performance.
Kind regards,
Arek