Thank you! Would you recommend reproofing it afterwards or isn't it necessary?Plenty of hot soapy water, a soft bristle brush (the ones on a pole you can plug a hose onto are ideal) a bit of elbow grease, followed by a good rinse (of the awning not you) with a hosepipe, and leave it to air dry.
Job done.
Not necessarily.Surely it will need reproofing especially the area "scrubbed" with soapy water
Think it's the thread used in the stitching that expands when wet.Not necessarily.
All new awnings come with a warning that they will leak until exposed to weather, rain. This causes the fabric fibres to expand making them water tight.