When cleaning rendered surfaces, traditional high-pressure methods can cause cracks, water ingress, and surface damage. Softwashing offers a safer, more effective approach—perfect for Australia’s diverse range of render types, from acrylic to cement. Here’s a detailed guide to cleaning render safely with softwash techniques:
1. Why Softwash Is Best for Rendered Walls
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Low pressure, high effectiveness: Softwashing uses gentle water flow combined with chemical solutions to remove dirt and organic growth—without the damage from pressure washing.
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Protects render integrity: High PSI can erode or crack render—softwash preserves surface health and longevity .
2. Essential Supplies & Equipment
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Low-pressure softwash pump and nozzle: Use a gentle softwash pump with a suitable nozzle (e.g., Benz 10 softwash nozzle) at 5–8 L/min flow.
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Water-fed pole or handheld wand: Enables reach without damaging surfaces.
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Cleaning solutions:
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Sodium hypochlorite mix (approx. 3:1 water:chemical) tackles heavy algae, moss, and black spots.
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Biocide rinse (e.g., EBC) provides long-term protection by preventing regrowth.
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Surfactants improve coverage and adhesion on vertical surfaces.
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Brushing tools: Soft-cladding brush for agitating treatment into textured surfaces.
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PPE: Gloves, goggles, protective clothing, and respirator for chemical safety
3. Preparation Steps
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Inspect the render: Look for cracks, flaking, or damaged areas—repair before cleaning.
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Protect surroundings: Shield plants, windows, and metal fittings from overspray.
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Test patch first: Always trial the chemical mix in an inconspicuous section to check compatibility.
4. Softwash Cleaning Process
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Apply the chemical solution: Using low-pressure spray, saturate the render evenly from top to bottom.
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Brush-in gently: Work the chemical into the surface for deeper penetration—ideal for textured finishes.
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Dwell time: Leave the solution to work—typically 30–60 minutes, depending on staining severity.
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Rinse thoroughly: Use low-pressure water to remove residues—essential to prevent salt build-up that could stain or damage the render.
5. Post-treatment & Maintenance
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Biocide application: After rinsing, apply a DDAC-based biocide to inhibit future organic growth.
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Scheduled upkeep: Reapply softwash treatments every 6–12 months or when stains reappear for long-lasting results.
6. Weather & Safety Best Practices
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Ideal conditions: Avoid direct sun, wind, or cold days—these can reduce effectiveness or cause overspray issues.
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Chemical handling: Mix in shade, label containers clearly, and store securely.
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Operator safety: Don’t skip PPE and ensure proper ventilation—protect skin, eyes, and lungs from exposure .
Why Softwash Australia Recommends This
Softwashing render with low-pressure chemical cleaning protects delicate surfaces while earning long-term value for clients. As specialists in softwash systems and coatings, Softwash Australia offers tailored surfactants and biocides crafted for Australian conditions—and backed by expert advice and training.
