To find it:
1. Locate the underhood fuse box: This is usually a black plastic box under the hood, often near the battery. The lid should have a diagram showing the fuse layout.
2. Consult the fuse box diagram: The diagram will list the fuses and their corresponding amperage. Look for a fuse labeled "Windshield Washer," "Washer," or something similar. The amperage might be around 10-20 amps.
3. Check the fuse: Carefully remove the fuse and inspect it for a blown filament (a broken wire inside the fuse). If the filament is broken, replace it with a fuse of the same amperage.
Important Note: If you replace the fuse and the washer still doesn't work, the problem is likely not a blown fuse. You might have a problem with the washer pump, wiring, or the washer fluid reservoir. Consult a Ford Focus repair manual or a qualified mechanic for further diagnosis.