Pressure washing an awning: good or bad idea?

Short answer: no, not on the fabric. A pressure washer sprays water at 100 to 160 bar. Awning, parasol and canopy fabrics are made to resist rain, not a concentrated jet that opens the fibres, strips the water-repellent coating and can tear seams.

What high pressure does to fabric

• Loss of water repellency: the factory coating is stripped in streaks; the fabric soaks up water and dries badly, encouraging mould.
• Streaks and halos visible in sunlight and impossible to fix.
• Weakened seams.
• Water in the cassette and motor on motorised awnings.

How professionals work

BoBache cleans fabric at low pressure with products suited to acrylic and polyester, a dwell time to lift moss and mould, then a thorough rinse. High pressure is used only on metal parts, with the fabric protected.

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