In a 1995 Mercury Sable, the windshield washer fuse is located in the fuse panel, which is typically found under the dashboard on the driver's side. You can identify the specific fuse for the windshield washer by referring to the fuse diagram on the fuse panel cover or in the owner's manual. The fuse for the windshield washer is usually labeled as "Washer" or similar. If the fuse is blown, replacing it should restore functionality to the windshield washer system.