Fabric awnings can become dirty and even mildewy from being out in the weather. Cleaning them without damaging the fabric or colors can be a challenge. Besides having a water hose and scrub brush, you need to choose a cleaning agent that won't bleach out the color or be too strong for the fabric causing it to break down. Many awnings are treated with a waterproofing coat as well so you will want to refresh that after cleaning.
Fabric Laundry Detergent
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Mixing your favorite laundry detergent in a bucket of hot water and scrubbing your awning is a safe way to clean the fabric without damaging it.
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Vinegar
Vinegar will remove dirt and mildew while killing mold spores and other bacteria that may be on the awning. Additionally, vinegar is safe for the fabric.
Dish Washing Detergent
A gentle dish washing detergent such as Palmolive or Dawn is a safe cleaning agent for your fabric awning.
Upholstery Cleaner
Basic upholstery cleaner that you can find in any store that sells cleaning products is good to use on a fabric awning.
Baking Soda Paste
Mix baking soda with a small amount of water to form a paste and scrub your awning with it. Baking soda cleans and refreshes without damaging the fabric, and rinses away clean.