If you need to Delete a Product, you can do this very easily from the Product section of your Shop's admin area.
Click on Products > All from the dashboard.
Select the Product that you would like to delete from the list.
Within the Product Edit screen scroll to the bottom of the page and hit the Delete Product button.
Alternatively, you can remain on the Products > All screen, and tick the boxes for each product you wish to remove, and press the 'Edit Selected' button then delete.
Note:
This is not reversible so ensure you are deleting the correct item.