/* Select todos los productos de BRASIL que sean grade */
SELECT * FROM catalog_product_website cpw where cpw.website_id = 8 and cpw.product_id IN (SELECT cpe.row_id FROM catalog_product_entity cpe WHERE sku like '%-%');

/* Desmarcar todos los productos de BRASIL que sean grade */
DELETE cpw FROM catalog_product_website cpw  where cpw.website_id = 8 and cpw.product_id IN (SELECT cpe.row_id FROM catalog_product_entity cpe WHERE sku like '%-%');