To find it:
1. Open the hood.
2. Locate the under-hood fuse box. This is usually a large plastic box, often black, near the battery. It may have a cover that needs to be opened.
3. Consult your owner's manual. This is the most reliable way to find the exact location of the wiper relay. The manual will have a fuse box diagram showing the location and function of each relay. The relay is often labeled clearly, sometimes with a windshield wiper symbol.
4. If you don't have the owner's manual, look for a diagram inside the fuse box cover. Some diagrams show relay locations.
5. If you can't find it visually, many online Ford Focus forums or repair websites have diagrams and instructions specific to the 2006 model year and trim. Search specifically for "2006 Ford Focus windshield wiper relay location" plus your trim level (e.g., "2006 Ford Focus SE windshield wiper relay location").
Remember to turn off the ignition before working with the fuse box and relays. If you're unsure about working on your car's electrical system, it's best to take it to a qualified mechanic.