How to Delete a Product
Go to the Store menu, under 'Products' click on Products link. 'Products' page appear. Find the product you wish to delete using Search Product options and click on at the end of its row. Confirm you wish to delete this product in a pop-up window.
A product exists in one primary category and possibly in several additional categories. When you delete a product you actually erase it both from primary and additional categories it is listed in.