1. Before cleaning any awning fabric, consult the fabric manufacturer for proper cleaning instructions.
2. Brush off all debris.
3. Clean from the bottom and work up.
4. Gently scrub the awning and valance with a soft-bristled brush and a mild soap such as dishwashing liquid.
5. Wash all parts of the awning. Missed spots show when dry.
6. Thoroughly and completely rinse the awning. The film left on the material will leave marks and a chalky residue.
7. About once a month rinse your awning down with a garden hose and keep the underside clean by simply brushing with a clean household broom.
8. Keep shrubbery and vines trimmed away from your awning, they contain acid that can damage fabric. In addition, check awning frames for rust. Though rust is not likely, it can cause deterioration of the frame and lead to fabric stains.
Or have your awning cleaned by a professional.