Reimport after delete

When trying to re-import some products after deleting them and you are receiving this error: "Already imported item." :

You will have to delete the product from the "Trash" too in order to be able to reimport them.

 

If that didn't worked you will have to install the WP-Optimize plugin and clean the database:

https://wordpress.org/plugins/wp-optimize/

 

If all of these do not work, you may try this plugin: https://wordpress.org/plugins/wp-clean-up-optimizer/