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How to clean sunbrella fabric
Wipe daily dirt and grime off of the fabric.
As soon as you notice dirt or grime on your sunbrella fabric, brush it off with a soft bristle brush. Every week or so, spray a basic soapy water cleanser over the fabric and use a sponge to rub the cleanser in.
This should bring the dirt to the surface of the fabric. Use a mild dishwashing soap that you'd usually use for handwashing your dishes.