Cleaning rendered walls often gets pushed to the bottom of the to-do list when spring cleaning, mainly because people aren’t sure of the best way to do it. With so much conflicting advice out there, it’s easy to feel overwhelmed. If your render is starting to look grimy, stained, or covered in algae, here’s some tips from WM Wash on how to bring it back to life without causing damage. What You Shouldn’t Do 1. Say No to Pressure Washing Pressure washers are great for patios and driveways says Guardian Resin, but they’re a disaster for render. The force of the water can blast away dirt, sure, but it can also push moisture deep into the surface, leading to cracks, damp issues, and costly repairs down the line. 2. Avoid Using Bleach Straight from the Bottle Bleach is a strong chemical, and using it undiluted can leave ugly discolored patches on your render. It’s also easy to accidentally splash it onto other surfaces, like windows and uPVC, causing damage. If you want to use bleach, mix it properly with water and other safe cleaning agents. The Best Ways to Clean Rendered Walls 1. Soft Washing: Gentle but Effective Soft washing is the safest and most effective method. Instead of blasting dirt away with pressure, it uses a specially formulated cleaning solution that breaks down algae, moss, and grime at a molecular level. The key ingredients in most soft wash solutions include: How to Soft Wash Your Render: Pro Tip : Render Hero says that if your render is colored, test a small, hidden area first to ensure there’s no fading. 2. Steam Cleaning: A Chemical-Free Alternative If you prefer not to use cleaning solutions, steam cleaning is an effective, eco-friendly option. High-temperature steam loosens dirt and organic buildup without the risk of surface damage. Why Steam Cleaning Works Well: However, using a steam cleaner properly takes skill. If you’re unsure, it’s worth bringing in a professional who specializes in render cleaning. 3. Everyday Cleaning with Household Products For minor stains, a simple solution of warm water and dish soap works surprisingly well. It’s ideal for: Use a soft brush or sponge to apply the soapy water, then rinse with a garden hose (not a pressure washer). How to Keep Your Render Looking Fresh 1. Stay on Top of Gutter Maintenance Blocked gutters cause water to run down your walls, which creates the perfect breeding ground for algae and mold. Check and clean them regularly to prevent moisture buildup on your render. 2. Apply a Long-Lasting Protection Treatment Once your render is clean, consider applying a fungicidal wash to prevent algae from coming back, says Uniwash Team. This treatment acts as a protective layer, keeping your walls cleaner for longer and reducing the need for frequent deep cleaning. Final Thoughts Rendered walls add character to a home, but they require the right care to stay in top condition. Instead of risking damage with pressure washing or harsh chemicals, opt for safer alternatives like soft washing, steam cleaning, or mild household solutions. Want to make maintenance easier? Invest in a protective treatment or schedule a professional clean to keep your home’s exterior looking its best with minimal effort.
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