Quickest way would be to use direct queries. Remember to put SET FOREIGN_KEY_CHECKS = 0; at the start of the queries and SET FOREIGN_KEY_CHECKS = 1; at the end.

http://magento.stackexchange.com/questions/68749/how-to-delete-all-sample-data-magento-1-9

products

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_label`;
TRUNCATE TABLE `catalog_product_super_attribute_pricing`;
TRUNCATE TABLE `catalog_product_super_attribute`;
TRUNCATE TABLE `catalog_product_super_link`;
TRUNCATE TABLE `catalog_product_enabled_index`;
TRUNCATE TABLE `catalog_product_website`;
TRUNCATE TABLE `catalog_category_product_index`;
TRUNCATE TABLE `catalog_category_product`;
TRUNCATE TABLE `cataloginventory_stock_item`;
TRUNCATE TABLE `cataloginventory_stock_status`;
TRUNCATE TABLE `cataloginventory_stock`;
INSERT  INTO `catalog_product_link_type`(`link_type_id`,`code`) VALUES (1,'relation'),(2,'bundle'),(3,'super'),(4,'up_sell'),(5,'cross_sell');
INSERT  INTO `catalog_product_link_attribute`(`product_link_attribute_id`,`link_type_id`,`product_link_attribute_code`,`data_type`) VALUES (1,2,'qty','decimal'),(2,1,'position','int'),(3,4,'position','int'),(4,5,'position','int'),(6,1,'qty','decimal'),(7,3,'position','int'),(8,3,'qty','decimal');
INSERT  INTO `cataloginventory_stock`(`stock_id`,`stock_name`) VALUES (1,'Default');
TRUNCATE TABLE `catalog_product_entity`;
SET FOREIGN_KEY_CHECKS = 1;

categories

TRUNCATE TABLE `catalog_category_entity`;
TRUNCATE TABLE `catalog_category_entity_datetime`;
TRUNCATE TABLE `catalog_category_entity_decimal`;
TRUNCATE TABLE `catalog_category_entity_int`;
TRUNCATE TABLE `catalog_category_entity_text`;
TRUNCATE TABLE `catalog_category_entity_varchar`;
TRUNCATE TABLE `catalog_category_product`;
TRUNCATE TABLE `catalog_category_product_index`;

INSERT  INTO `catalog_category_entity`(`entity_id`,`entity_type_id`,`attribute_set_id`,`parent_id`,`created_at`,`updated_at`,`path`,`POSITION`,`level`,`children_count`) VALUES (1,3,0,0,'0000-00-00 00:00:00','2009-02-20 00:25:34','1',1,0,1),(2,3,3,0,'2009-02-20 00:25:34','2009-02-20 00:25:34','1/2',1,1,0);
INSERT  INTO `catalog_category_entity_int`(`value_id`,`entity_type_id`,`attribute_id`,`store_id`,`entity_id`,`value`) VALUES (1,3,32,0,2,1),(2,3,32,1,2,1);
INSERT  INTO `catalog_category_entity_varchar`(`value_id`,`entity_type_id`,`attribute_id`,`store_id`,`entity_id`,`value`) VALUES (1,3,31,0,1,'Root Catalog'),(2,3,33,0,1,'root-catalog'),(3,3,31,0,2,'Default Category'),(4,3,39,0,2,'PRODUCTS'),(5,3,33,0,2,'default-category');

/**** Magento ver. 1.6.x.x ****/

TRUNCATE TABLE `catalog_category_entity`;
TRUNCATE TABLE `catalog_category_entity_datetime`;
TRUNCATE TABLE `catalog_category_entity_decimal`;
TRUNCATE TABLE `catalog_category_entity_int`;
TRUNCATE TABLE `catalog_category_entity_text`;
TRUNCATE TABLE `catalog_category_entity_varchar`;
TRUNCATE TABLE `catalog_category_product`;
TRUNCATE TABLE `catalog_category_product_index`;

INSERT  INTO `catalog_category_entity`(`entity_id`,`entity_type_id`,`attribute_set_id`,`parent_id`,`created_at`,`updated_at`,`path`,`POSITION`,`level`,`children_count`) VALUES (1,3,0,0,'0000-00-00 00:00:00','0000-00-00 00:00:00','1',1,0,1), (2,3,3,1,'0000-00-00 00:00:00','0000-00-00 00:00:00','1/2','1','1','0');
INSERT  INTO `catalog_category_entity_int`(`value_id`,`entity_type_id`,`attribute_id`,`store_id`,`entity_id`,`value`) VALUES (1,3,32,0,2,1),(2,3,36,0,2,1),(3,3,61,0,2,1),(4,3,44,0,2,NULL),(5,3,45,0,2,1),(6,3,62,0,2,1),(7,3,63,0,2,1),(8,3,64,0,2,NULL);
INSERT  INTO `catalog_category_entity_varchar`(`value_id`,`entity_type_id`,`attribute_id`,`store_id`,`entity_id`,`value`) VALUES (1,3,31,0,1,'Root Catalog'),(2,3,35,0,2,'Default Category'),(3,3,37,0,2,'default-category'),(4,3,40,0,2,NULL),(5,3,43,0,2,'PRODUCTS'),(6,3,52,0,2,NULL),(7,3,55,0,2,NULL);

sales

SET FOREIGN_KEY_CHECKS=0; 
TRUNCATE `sales_flat_creditmemo`; 
TRUNCATE `sales_flat_creditmemo_comment`; 
TRUNCATE `sales_flat_creditmemo_grid`; 
TRUNCATE `sales_flat_creditmemo_item`; 
TRUNCATE `sales_flat_invoice`; 
TRUNCATE `sales_flat_invoice_comment`; 
TRUNCATE `sales_flat_invoice_grid`; 
TRUNCATE `sales_flat_invoice_item`; 
TRUNCATE `sales_flat_order`; 
TRUNCATE `sales_flat_order_address`; 
TRUNCATE `sales_flat_order_grid`; 
TRUNCATE `sales_flat_order_item`; 
TRUNCATE `sales_flat_order_payment`; 
TRUNCATE `sales_flat_order_status_history`; 
TRUNCATE `sales_flat_quote`; 
TRUNCATE `sales_flat_quote_address`; 
TRUNCATE `sales_flat_quote_address_item`; 
TRUNCATE `sales_flat_quote_item`; 
TRUNCATE `sales_flat_quote_item_option`; 
TRUNCATE `sales_flat_quote_payment`; 
TRUNCATE `sales_flat_quote_shipping_rate`; 
TRUNCATE `sales_flat_shipment`; 
TRUNCATE `sales_flat_shipment_comment`; 
TRUNCATE `sales_flat_shipment_grid`; 
TRUNCATE `sales_flat_shipment_item`; 
TRUNCATE `sales_flat_shipment_track`; 
TRUNCATE `sales_invoiced_aggregated`; 
TRUNCATE `sales_invoiced_aggregated_order`; 
TRUNCATE `sales_payment_transaction`;
TRUNCATE `sales_order_aggregated_created`; 
TRUNCATE `sales_order_tax`;
TRUNCATE `sales_order_tax_item`;
TRUNCATE `sendfriend_log`; 
TRUNCATE `tag`; 
TRUNCATE `tag_relation`; 
TRUNCATE `tag_summary`; 
TRUNCATE `wishlist`; 
TRUNCATE `log_quote`; 
TRUNCATE `report_event`; 
ALTER TABLE `sales_flat_creditmemo` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_creditmemo_comment` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_creditmemo_grid` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_creditmemo_item` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_invoice` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_invoice_comment` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_invoice_grid` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_invoice_item` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_order` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_order_address` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_order_grid` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_order_item` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_order_payment` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_order_status_history` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_quote` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_quote_address` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_quote_address_item` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_quote_item` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_quote_item_option` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_quote_payment` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_quote_shipping_rate` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_shipment` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_shipment_comment` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_shipment_grid` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_shipment_item` AUTO_INCREMENT=1; 
ALTER TABLE `sales_flat_shipment_track` AUTO_INCREMENT=1; 
ALTER TABLE `sales_invoiced_aggregated` AUTO_INCREMENT=1; 
ALTER TABLE `sales_invoiced_aggregated_order` AUTO_INCREMENT=1; 
ALTER TABLE `sales_payment_transaction` AUTO_INCREMENT=1; 
ALTER TABLE `sales_order_aggregated_created` AUTO_INCREMENT=1; 
ALTER TABLE `sales_order_tax` AUTO_INCREMENT=1; 
ALTER TABLE `sales_order_tax_item` AUTO_INCREMENT=1; 
ALTER TABLE `sendfriend_log` AUTO_INCREMENT=1; 
ALTER TABLE `tag` AUTO_INCREMENT=1; 
ALTER TABLE `tag_relation` AUTO_INCREMENT=1; 
ALTER TABLE `tag_summary` AUTO_INCREMENT=1; 
ALTER TABLE `wishlist` AUTO_INCREMENT=1; 
ALTER TABLE `log_quote` AUTO_INCREMENT=1; 
ALTER TABLE `report_event` AUTO_INCREMENT=1; 
SET FOREIGN_KEY_CHECKS=1;

customers

SET FOREIGN_KEY_CHECKS=0;
-- reset customers
TRUNCATE customer_address_entity;
TRUNCATE customer_address_entity_datetime;
TRUNCATE customer_address_entity_decimal;
TRUNCATE customer_address_entity_int;
TRUNCATE customer_address_entity_text;
TRUNCATE customer_address_entity_varchar;
TRUNCATE customer_entity;
TRUNCATE customer_entity_datetime;
TRUNCATE customer_entity_decimal;
TRUNCATE customer_entity_int;
TRUNCATE customer_entity_text;
TRUNCATE customer_entity_varchar;
TRUNCATE log_customer;
TRUNCATE log_visitor;
TRUNCATE log_visitor_info;

ALTER TABLE customer_address_entity AUTO_INCREMENT=1;
ALTER TABLE customer_address_entity_datetime AUTO_INCREMENT=1;
ALTER TABLE customer_address_entity_decimal AUTO_INCREMENT=1;
ALTER TABLE customer_address_entity_int AUTO_INCREMENT=1;
ALTER TABLE customer_address_entity_text AUTO_INCREMENT=1;
ALTER TABLE customer_address_entity_varchar AUTO_INCREMENT=1;
ALTER TABLE customer_entity AUTO_INCREMENT=1;
ALTER TABLE customer_entity_datetime AUTO_INCREMENT=1;
ALTER TABLE customer_entity_decimal AUTO_INCREMENT=1;
ALTER TABLE customer_entity_int AUTO_INCREMENT=1;
ALTER TABLE customer_entity_text AUTO_INCREMENT=1;
ALTER TABLE customer_entity_varchar AUTO_INCREMENT=1;
ALTER TABLE log_customer AUTO_INCREMENT=1;
ALTER TABLE log_visitor AUTO_INCREMENT=1;
ALTER TABLE log_visitor_info AUTO_INCREMENT=1;
SET FOREIGN_KEY_CHECKS=1;

sources

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