How to Clean and Maintain Your Full Cassette Awning Year-Round

I've been installing and servicing awnings for going on 14 years, and if there's one thing I've learned, the difference between an awning that lasts 8 years and one that hits 20 comes down almost entirely to maintenance. Full cassette awnings have a real advantage here — the fabric and mechanism tuck completely inside the housing when retracted — but that doesn't mean you can ignore them. Here's the routine I recommend.

The Seasonal Cleaning Routine
Spring Deep Clean (March–April)

After a long winter, your awning needs a proper reset. I schedule spring deep cleans for a dry day when temps sit around 60–70°F. Extend the awning fully and brush off loose debris with a soft-bristled broom. Then mix a few drops of mild dish soap — I use plain Dawn — into a bucket of lukewarm water. Never use hot water on acrylic fabric; it can weaken the water-repellent coating.

Work in sections with a soft sponge, rinsing each panel before moving on. Let it air dry completely before retracting, which usually takes 2–3 hours on a breezy day.

Summer Spot Cleaning (June–August)

During peak season, bird droppings, tree sap, and pollen are your main enemies. Spot clean these immediately — the acid in bird droppings can permanently stain acrylic fabric within 48 hours. I keep a spray bottle with diluted Dawn and water (1 tablespoon per quart) on the patio.

Fall Prep (September–October)

Before leaves start falling, give the awning one more full clean. Check the arms and joints for squeaking or stiffness — a dry silicone spray on the pivot points fixes this in about 5 minutes. Clear out the gutter channel along the front bar; I've pulled handfuls of decomposed leaves from cassettes that were causing drainage backups.

Winter Storage (November–February)

Retract fully, disconnect power on motorized units, and you're essentially done. The cassette handles the rest.

Fabric Care: Solution-Dyed Acrylic Specifics
If you own a mid-to-high-end full cassette awning, there's a good chance you're working with solution-dyed acrylic fabric from Dickson or Sattler. These are excellent materials — the color runs through the fiber, so fading is minimal, but they have specific care needs.

Never use bleach, solvent-based cleaners, or anything abrasive. The dirt-resistant finish on Dickson Orchestra fabric is a topical treatment that harsh chemicals will strip right off. Stick to mild soap and water. For stubborn stains, a specialized acrylic cleaner like 303 Fabric Cleaner runs about $18 for a 16-ounce bottle and handles the job without damaging the coating.

Aluminum Frame Cleaning
The frame is powder-coated aluminum, and it's tough. I wipe mine down with a microfiber cloth and the same soapy water mix. Avoid anything with grit — no scouring pads, no steel wool. If you spot chipped paint, touch it up with a matching paint pen (around $12 from the manufacturer) before corrosion gets a foothold.

Motor Maintenance
Here's the good news: Somfy motors barely need anything. These are sealed units with lifetime lubrication. Just check the wiring at the wall switch is snug and corrosion-free. If the motor starts hesitating or grinding, the internal gears may be failing. Motor replacement runs 250–400 installed.

How Often Should You Clean?
Clean the fabric every 3–4 months and inspect the frame twice a year (spring and fall). If you live in a high-pollen area or under trees, bump that to every 2 months during summer.

DIY vs Professional Cleaning
A full DIY clean costs about 25insuppliesandaSaturdayafternoon.Professionalcleaningservicescharge150–$250 and will also lubricate the mechanism and inspect the motor. Some manufacturers require annual professional servicing to keep warranty coverage valid.

Pros of DIY:

Saves $150+ per cleaning
You catch problems early because you're hands-on
No scheduling headaches

 
Cons of DIY:

Can miss mechanical issues you're not trained to spot
Risk of using the wrong cleaners
Time investment of 2–3 hours minimum

 
FAQ
Q: Can I use a pressure washer on my awning fabric?

No. Even on the lowest setting, a pressure washer can force water through the fabric weave and damage the water-repellent coating. It can also bend the aluminum frame if aimed too close. Stick to a garden hose with a spray nozzle.

Q: My fabric has black spots that won't come off with soap. What is it?

Likely mildew. Mix 1 cup of white vinegar with a gallon of water, apply with a sponge, and let it sit for 15 minutes before rinsing. If spots return within a week, the mildew has penetrated the fibers and the fabric may need replacing.

Q: How do I know if my Somfy motor needs servicing?

Listen for changes. A healthy Somfy motor is nearly silent. If you hear grinding, clicking, or notice the awning extending slower than usual, the internal gears may be wearing out. Most Somfy motors last 8–12 years with normal use.