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<?php
/**
 * @snippet       Remove SALE badge @ Product Archives and Single Product
 * @how-to        Watch tutorial @ https://businessbloomer.com/?p=19055
 * @sourcecode    https://businessbloomer.com/?p=17429
 * @author        Rodolfo Melogli
 * @compatible    WooCommerce 3.2.3
 */
 
remove_action( 'woocommerce_before_shop_loop_item_title', 'woocommerce_show_product_loop_sale_flash', 10 );
remove_action( 'woocommerce_before_single_product_summary', 'woocommerce_show_product_sale_flash', 10 );