[Koha] How to delete book in koha

To delete a single book in KOHA, is it ok to search the book with its accession number (barcode) ,click edit and select the option - delete book or should i use the option delete item. To completely delete all the bibliographic details. I tried to use truncate biblio, truncate items, truncate biblioitems. But still when I give a search I get the details, though when clicked on the book name, the book is not available message is shown. What other steps should I do. I tried koha-zebra-rebuild, but in vain. -With Thanks & Regards ​Tanzeem​