How to Clean a Canvas Awning | Step-By-Step Fabric Care

Clean a canvas awning by brushing off loose dirt, rinsing with water, washing with mild soap and a soft-bristle brush, rinsing thoroughly, and air-drying completely.

For the full breakdown, see our best Canvas Awning Cleaner guide.

Your canvas awning takes a beating all summer—UV rays, bird droppings, pollen, and roof run-off leave it streaked and grimy. The bad news: the wrong cleaning method can permanently damage the fabric. Whether you’re dealing with routine grime or stubborn mildew stains, the process stays the same—gentle soap, soft bristles, and plenty of rinsing. Here’s the exact routine that keeps Sunbrella and other canvas awnings looking new for years.

The Basic Cleaning Process For A Canvas Awning

You can clean most canvas awnings while they’re still mounted on the frame, as long as you can reach the whole surface safely.

1. Brush off loose dirt. Use a dry, soft-bristle brush to remove dust, pollen, and debris before anything gets wet.
2. Hose down the fabric. Rinse with clean water from top to bottom to knock off surface grime.
3. Mix a mild soap solution.
4. Scrub gently. Dip a soft-bristle brush in the solution and clean the fabric with light, even strokes.
5. Let it soak briefly. Allow the soap to sit on stubborn areas for a few minutes before rinsing.
6. Rinse thoroughly. Wash away every trace of soap residue, working from the top down.
7. Air dry completely. Leave the awning extended until fully dry before retracting or storing it.

After the fabric dries, you’re done. Sunbrella’s care sheet also notes that giving awnings a quick hose-down about once a month helps delay deep cleaning.

Removing Mildew And Stubborn Stains

Mildew, tree sap, and roof run-off stains usually won’t budge with soap alone. For these tougher spots, Sunbrella’s care guidance allows a diluted chlorine bleach solution—the key is keeping the concentration low so it cleans without weakening the fabric.

Sunbrella offers two slightly different formulas for the same job. Either mix works; start with the weaker solution and test it on a hidden corner first. After soaking, scrub gently with the soft brush, rinse completely until no residue remains, and air dry. For bird droppings or grease spots, pretreat directly with mild soap before the full wash.

Acetone, turpentine, and industrial degreasers will break down the fabric’s water-repellent coating and can cause permanent damage.

What Not To Do When Cleaning Canvas Awnings

Most awning damage comes from well-intentioned but overly aggressive cleaning. Avoid these common mistakes:

• Never pressure wash. The high-pressure spray forces water through the weave and strips the water-repellent finish.
• Sunbrella explicitly warns against anything that abrades the fabric.
• Skip detergent. The care sheet says plainly: “Never detergent.” Stick with mild soap only.
• Never use hot water. Keep it under 100 degrees—cold to lukewarm is the safe zone.
• Sunbrella fabrics must air dry only; heat shrinks and damages the fibers.
• A rolled-up wet awning is a guaranteed mildew nursery.

If your awning’s fabric is removable and the manufacturer’s tag says it’s machine washable, you can wash it with mild soap on cold, then hang it to air dry. Most full-size awnings are too large for a residential washer, so the hand-wash routine above is the practical default.

Keeping The Fabric Clean Longer

A quick monthly rinse makes a noticeable difference. Just hosing the awning down every few weeks prevents dirt from embedding in the weave, which means you’ll need a full deep clean less often.

Sunbrella’s official awning cleaning guide offers the most detailed version of this care routine straight from the fabric maker.

If your awning’s fabric is beyond a simple refresh, or you’d rather use a purpose-made product than dish soap, our roundup of the best canvas awning cleaners covers tested options that respect the same no-pressure-washing rules.

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