The discovery was made over the weekend at the Pacific coast seaport of Manzanillo, the Navy said. Mexico has become a major producer of meth, and drug smugglers frequently are stopped at the border with liquid meth in their windshield washer fluid or other containers in their cars. Mexico has become a major producer of meth, and drug smugglers frequently are stopped at the border with liquid meth in their windshield washer fluid or other containers in their cars