Rinse off the dirt before washing a car. Any dirt that is rubbed into the surface can cause scratches. Dish washing detergents are designed to strip grease and grime, and
they will actually strip the wax from your car. Use a product specifically designed for washing cars.
Use a large bucket so the dirt particles sink to the bottom of the container and the fresh suds and water you apply are clean and free of contamination. Or you can use
two buckets, one for rinsing and one for the suds.
Make sure your car surface is cool (preferably in the shade) by hosing the entire vehicle. Apply suds to the upper areas first using thick, terry cloth towels or a wash
mitt and work your way down. Rinse the car clean by running a slow stream of water instead of a high pressure spray to reduce water spots and drying time. When washing your vehicle by hand, take the time to run your wash mitt along the inside
bottom edge of the doors, lift gate, hood and trunk, etc. These areas trap dirt and moisture.
Clean the tires first, then the wheels. Cleaning the wheels, especially those with BMW's high-quality finish, is important since brake dust
and road salt can cause irreversible corrosion.
Once the entire vehicle is washed and rinsed, take a clean, dry towel or cloth and wipe the vehicle down, again starting at the top. You can also use a product like a
synthetic chamois. Don't use a leather chamois since it can pull oils from the paint and remove the wax.