Hello @thewoodden. There's a few things you can do. You can add a filter to your View (or create a new View) to filter all the records that contain whatever keyword you want. Then you can select all with this little button in the top left corner of the grid, right-click any of the records and select "Delete all selected records"
To make this even easier, you can make a view that filters records you know should be deleted based on whatever criteria you want like "Records over 30 days old & contains the word 'Bench'". Then you can add an automation that deletes any record that enters that View.