How to Safely Clean Surface Stains on GRC Decorative Panels? Practical Methods and Precautions Explained

Preserving the Beauty and Durability of GRC Decorative Panels: Professional Cleaning Guide and Industry Experience Sharing

In the field of architectural decoration, GRC (glass fiber reinforced concrete), with its excellent plasticity and durability, is widely used for exterior wall cladding panels and decorative components in high-end venues such as grand theaters, commercial complexes, and landmark buildings. However, long-term exposure to the external environment inevitably leads to stain accumulation on GRC decorative panel surfaces, affecting both the building's aesthetics and service life. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on its professional expertise in detailed design, manufacturing, and after-sales maintenance to provide you with a detailed scientific cleaning solution for GRC decorative panels—one that balances safety and effectiveness, keeping architectural beauty enduringly fresh.

Types of Stains on GRC Decorative Panels and Cleaning Principles: Protecting Material Properties at the Source

GRC material is a composite of cement, glass fibers, and additives, and its surface is typically treated to be water-repellent and stain-resistant, yet targeted cleaning is still required. Common stains fall into three categories: first, physical deposits such as dust and sediment; second, limescale and mildew formed by rainwater runoff; third, chemical contamination such as oil stains and paint. Cleaning must follow two key principles: first, avoid using strongly acidic or alkaline cleaners to prevent corrosion of the surface protective layer; second, control the hardness of cleaning tools to prevent scratching the GRC texture—this is core experience summarized by Qinglong through the maintenance of thousands of projects, and it is especially applicable to delicate components such as European classical moldings and sculpted reliefs.

Four-Step Safe Cleaning Method: A Practical Solution Validated by Qinglong's 28 Years of Engineering Practice

**Step 1: Surface Pre-treatment, Gently Remove Physical Stains** For daily dust and loose dirt, it is recommended to gently wipe with a soft, damp cloth or a soft-bristle brush together with clean water. For stubborn sediment, a low-pressure water gun (water pressure ≤0.3MPa) can be used to rinse at an angle from a distance of 50cm, avoiding direct spraying at joints. Qinglong applied this method to large-area GRC curtain walls in projects such as the Nanjing East Road Century Plaza renovation—both efficient and protective of the special texture of translucent concrete.

**Step 2: Targeted Descaling, Solving Limescale and Mildew Problems** For limescale or mild mildew stains, prepare a neutral cleaner (such as a specialized stone cleaner with pH 7-8), apply with a sponge and wipe gently, let it sit for 3-5 minutes, then rinse with clean water. For more severe mildew, a 10% concentration of hydrogen peroxide (3% medical-grade hydrogen peroxide diluted 3 times) can be applied locally; ensure adequate ventilation and drying before rinsing clean with water. This method has been validated in Qinglong's overseas projects (such as a commercial complex in Malaysia) and is particularly effective for GRC panels in hot and humid environments.

**Step 3: Chemical Contamination Treatment, Beware of Solvent-Based Cleaner Risks** When facing oil stains or paint contamination, never directly use strong solvents such as banana oil or acetone. It is recommended to first gently scrape off surface contaminants with a blade, then wipe repeatedly with neutral soapy water; if necessary, a specialized GRC degreaser can be used (compatibility must be tested in an inconspicuous area beforehand). Qinglong's technical team reminds you: inferior cleaners may cause the GRC surface to lose its luster, so when selecting products, make sure they comply with the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018).

**Step 4: Post-Cleaning Maintenance, Extend the Service Life of GRC Panels** After cleaning, use a dry cloth to absorb surface moisture to prevent residual water stains from forming new limescale. For GRC components exposed to strong ultraviolet light or high-humidity environments, it is recommended to apply Qinglong's specialized GRC protective coating every 2-3 years to enhance water and stain resistance—this is a maintenance solution developed by Qinglong, as a National High-Tech Enterprise, in combination with 58 patented technologies, and it has already been applied in numerous landmark projects across China.

Industry Expert Reminders: Three Cleaning Taboos and Long-Term Maintenance Recommendations

As Vice Chairman Unit of the China GRC Association, Qinglong emphasizes the "Three Don'ts Principle" during cleaning: do not use sharp tools such as steel wool or stiff brushes; do not spray directly with high-pressure water guns (especially for interior components such as GRG ceilings); and do not mix different types of cleaners. For long-term maintenance, it is recommended to establish a regular inspection system—cleaning quarterly in rainy seasons or areas with severe air pollution, and semi-annually in other regions. For GRC components with complex shapes (such as hyperbolic exterior walls and openwork sculptures), contact Qinglong's professional maintenance team to develop a customized cleaning plan using 3D scanning technology.

From detailed design to after-sales maintenance, Qinglong has always upheld the mission of "Creating Aesthetic Architecture," transforming 28 years of industry experience into customer value. Cleaning GRC decorative panels is not just about maintaining appearance—it is long-term protection of architectural quality. Only by choosing scientific methods and relying on professional support can GRC materials continue to shine through the test of time. This is Qinglong's solemn commitment, as a leading UHPC/GRC/GRG/GRP manufacturer, to every architectural work.