1989 Ford Bronco Owner's Manual - Page 265

Cleaning • Do not use hydrofluoric acid-based or high caustic-based wheel cleaners, steel wool, fuels or strong household detergent. • To remove tar and grease, use Motorcraft Bug and Tar Remover (ZC-42), available from your authorized dealer. ENGINE Engines are more efficient when they are clean because grease and dirt buildup keep the engine warmer than normal. When washing: • Take care when using a power washer to clean the engine. The high-pressure fluid could penetrate the sealed parts and cause damage. • Do not spray a hot engine with cold water to avoid cracking the engine block or other engine components. • Spray Motorcraft Engine Shampoo and Degreaser (ZC-20) on all parts that require cleaning and pressure rinse clean. In Canada, use Motorcraft Engine Shampoo (CXC-66-A). • Cover the highlighted areas to prevent water damage when cleaning the engine. • Never wash or rinse the engine while it is hot or running; water in the running engine may cause internal damage. • Never wash or rinse any ignition coil, spark plug wire or spark plug well, or the area in and around these locations. 265 2010 Econoline (eco) Owners Guide, 3rd Printing USA (fus)