Spray your furniture down thoroughly using a garden hose with a spray nozzle. Spraying the furniture down dislodges a great deal of dirt and makes the cleaning process easier.
Squirt 1/4 cup of dish soap into a bucket and add 1 gallon of hot water. Swish the water around with your hand to ensure that the dish soap dissolves and creates significant suds.
Dip your soft-bristled scrub brush into the soapy water and scrub your patio furniture down one strap at a time. Remember to do the underside of each piece as well, where the greatest amount of dirt often collects.
Spray your furniture down thoroughly with your hose again to remove the soap suds and any remaining dirt. Allow your furniture to air-dry in the sun.