Brushing

• Before you put any solution on your awnings, brush off all loose dirt and debris. This will prevent the dirt from soaking into the fabric. Use a broom or any soft cleaning brush and rub all areas of the fabric. You can purchase a brush at any janitorial supply shop. Clean underneath and on top of the awning. Use a ladder for hard-to-reach areas.
  
  

Washing

• Use 2 oz. of dish washing liquid for every 1 gallon of water. The cleaning fluid should be something gentle so that it will not stain or fade the canvas. Hot water works best for removing stains. Dip your brush into the detergent and scrub the awning. For tough stains, you may use a harder brush. If you have tree sap on them, you may try using a citrus-based solvent or an acetone. You may want to try it in a hidden area first to see if it will bleach the fabric.
  
  

Rinsing

• After you have scrubbed the awnings, use a garden hose and completely soak them. Rinse the undersides, and pay attention to the corners. Make sure you get all traces of detergent off of the fabric. Detergent that is left behind can cause streaking, discoloration and a chalky film, so it's important to remove all soap. You can re-scrub areas that still show signs of dirt after you have rinsed.
  
  

Metal Awnings

• Metal awnings can be much easier to clean than canvas awnings. To clean a metal awning, use a good emulsifying detergent such as Leading Edge HD Emulsifying Detergent. Apply the detergent first by applying it with a pressure washer. The high-speed spray will get much of the dirt and grime off. Allow it to set for a few minutes, then use the pressure washer with just water to rinse the area clean. If you want the awnings to shine, use a good rubbing wax as a finishing coat.