You can delete all the product using Direct Sql.
Please take backup your database, and run the following sql queries.
Reset all product tables. Beware, below script will delete ALL your product data so do it carefully.
`SET FOREIGN_KEY_CHECKS = 0;
TRUNCATE TABLE `catalog_product_bundle_option`;
TRUNCATE TABLE `catalog_product_bundle_option_value`;
TRUNCATE TABLE `catalog_product_bundle_selection`;
TRUNCATE TABLE `catalog_product_entity_datetime`;
TRUNCATE TABLE `catalog_product_entity_decimal`;
TRUNCATE TABLE `catalog_product_entity_gallery`;
TRUNCATE TABLE `catalog_product_entity_int`;
TRUNCATE TABLE `catalog_product_entity_media_gallery`;
TRUNCATE TABLE `catalog_product_entity_media_gallery_value`;
TRUNCATE TABLE `catalog_product_entity_text`;
TRUNCATE TABLE `catalog_product_entity_tier_price`;
TRUNCATE TABLE `catalog_product_entity_varchar`;
TRUNCATE TABLE `catalog_product_link`;
TRUNCATE TABLE `catalog_product_link_attribute`;
TRUNCATE TABLE `catalog_product_link_attribute_decimal`;
TRUNCATE TABLE `catalog_product_link_attribute_int`;
TRUNCATE TABLE `catalog_product_link_attribute_varchar`;
TRUNCATE TABLE `catalog_product_link_type`;
TRUNCATE TABLE `catalog_product_option`;
TRUNCATE TABLE `catalog_product_option_price`;
TRUNCATE TABLE `catalog_product_option_title`;
TRUNCATE TABLE `catalog_product_option_type_price`;
TRUNCATE TABLE `catalog_product_option_type_title`;
TRUNCATE TABLE `catalog_product_option_type_value`;
TRUNCATE TABLE `catalog_product_super_attribute`;
TRUNCATE TABLE `catalog_product_super_attribute_label`;
TRUNCATE TABLE `catalog_product_super_attribute_pricing`;
TRUNCATE TABLE `catalog_product_super_link`;
TRUNCATE TABLE `catalog_product_enabled_index`;
TRUNCATE TABLE `catalog_product_website`;
TRUNCATE TABLE `catalog_product_entity`;
TRUNCATE TABLE `cataloginventory_stock`;
TRUNCATE TABLE `cataloginventory_stock_item`;
TRUNCATE TABLE `cataloginventory_stock_status`;
INSERT INTO `catalog_product_link_type` VALUES(1, 'relation');
INSERT INTO `catalog_product_link_type` VALUES(3, 'super');
INSERT INTO `catalog_product_link_type` VALUES(4, 'up_sell');
INSERT INTO `catalog_product_link_type` VALUES(5, 'cross_sell');
INSERT INTO `catalog_product_link_attribute` VALUES(1, 1, 'position', 'int');
INSERT INTO `catalog_product_link_attribute` VALUES(2, 3, 'position', 'int');
INSERT INTO `catalog_product_link_attribute` VALUES(3, 3, 'qty', 'decimal');
INSERT INTO `catalog_product_link_attribute` VALUES(4, 4, 'position', 'int');
INSERT INTO `catalog_product_link_attribute` VALUES(5, 5, 'position', 'int');
INSERT INTO `cataloginventory_stock` VALUES(1, 'Default');
SET FOREIGN_KEY_CHECKS = 1;`
Remove the Product counts from category at back-end
`SET FOREIGN_KEY_CHECKS = 0;
TRUNCATE TABLE `catalog_category_product`;
TRUNCATE TABLE `catalog_category_product_index`;
SET FOREIGN_KEY_CHECKS = 1;`
Remove the Bestseller and Most view Products at Dashboards
`SET FOREIGN_KEY_CHECKS = 0;
TRUNCATE TABLE `report_compared_product_index`;
TRUNCATE TABLE `report_viewed_product_aggregated_daily`;
TRUNCATE TABLE `report_viewed_product_aggregated_monthly`;
TRUNCATE TABLE `report_viewed_product_aggregated_yearly`;
TRUNCATE TABLE `report_viewed_product_index`;
TRUNCATE TABLE `sales_bestsellers_aggregated_daily`;
TRUNCATE TABLE `sales_bestsellers_aggregated_monthly`;
TRUNCATE TABLE `sales_bestsellers_aggregated_yearly`;
SET FOREIGN_KEY_CHECKS = 1;`
Flush all the flat table of products
`SET FOREIGN_KEY_CHECKS = 0;
DELETE FROM catalog_product_flat_1;
DELETE FROM catalog_product_flat_2;
DELETE FROM catalog_product_flat_3;
DELETE FROM catalog_product_flat_4;
DELETE FROM catalog_product_flat_5;
SET FOREIGN_KEY_CHECKS = 1;`
Remove the review and rating of products
`SET FOREIGN_KEY_CHECKS = 0;
TRUNCATE table `rating_option_vote`;
TRUNCATE table `rating_option_vote_aggregated`;
TRUNCATE table `review`;
TRUNCATE table `review_detail`;
TRUNCATE table `review_entity_summary`;
TRUNCATE table `review_store`;
SET FOREIGN_KEY_CHECKS = 1;`
For enterprise flush the following tables
`SET FOREIGN_KEY_CHECKS = 0;
TRUNCATE TABLE `catalog_category_flat_cl`;
TRUNCATE TABLE `catalog_category_product_cat_cl`;
TRUNCATE TABLE `catalog_category_product_index_cl`;
TRUNCATE TABLE `catalog_product_flat_cl`;
TRUNCATE TABLE `catalog_product_index_price_cl`;
TRUNCATE TABLE `cataloginventory_stock_status_cl`;
TRUNCATE TABLE `catalogsearch_fulltext_cl`;
SET FOREIGN_KEY_CHECKS = 1;`