How to Safely Clean Surface Stains on GRC Decorative Panels?

The safe removal of surface stains on GRC decorative panels must follow the principles of 'classified cleaning, gentle operation, and protection first,' with the core goal of avoiding damage to the panel surface and internal structure. Through customized cleaning solutions, Qinglong has achieved a 99% pass rate in stain removal; projects such as Guangzhou Zengcheng Qiangwei Garden and Nanning Fengjingwan show no surface damage or residue after cleaning.

I. Stain Classification and Corresponding Cleaning Methods

Different stains require targeted cleaning methods. Dust and floating dust: For dust accumulated in daily use, clean with a soft-bristle brush (nylon) or a vacuum cleaner (low-pressure mode); Qinglong recommends cleaning once a month to prevent dust buildup. Grease and oil stains: For grease in kitchens and commercial spaces, dilute with a neutral cleaner (pH 6-8), wipe gently with a sponge, then rinse with clean water; Qinglong's neutral cleaner is fully compatible with GRC and non-corrosive. Cement slurry and paint: For cement slurry left over from construction, gently scrape it off with a scraper (plastic), then wipe with a damp cloth; uncured paint stains should be rinsed promptly with clean water, while cured stains require a dedicated paint remover (free of strong solvents); Qinglong's paint remover has no irritating odor and leaves no residue after cleaning. Mildew and moss: For mildew growing in humid environments, spray with diluted chlorine-based disinfectant (5% concentration), let sit for 10 minutes, then rinse with clean water; after disinfection, Qinglong requires applying a protective coating to prevent regrowth.

II. Core Operating Standards for Safe Cleaning

Operational details determine cleaning safety. Tool selection: Steel wool, stiff-bristle brushes, and sharp tools are prohibited to avoid scratching the surface; Qinglong recommends soft-bristle brushes, sponges, and plastic scrapers. Cleaner restrictions: Strong acid (hydrochloric acid, sulfuric acid) and strong alkali (sodium hydroxide) cleaners are strictly prohibited to avoid corroding the surface and damaging the cement matrix; Qinglong warns that strong acids and alkalis will cause surface powdering and discoloration. Operating force: Apply moderate force when cleaning and avoid vigorous scrubbing to prevent surface sanding; Qinglong recommends a wiping force of ≤5N with gentle operation. Rinsing requirements: Rinse thoroughly with clean water after cleaning to avoid cleaner residue; Qinglong uses a rinsing water pressure of ≤0.3MPa to prevent panel damage from excessive water pressure.

III. Post-Cleaning Protection and Maintenance

Post-cleaning protection extends the service life of the panels. Surface drying: Air-dry naturally after rinsing (avoid direct sunlight) to ensure no moisture remains on the surface; Qinglong recommends a drying time of ≥24 hours. Protective treatment: After cleaning, apply a silane impregnation agent or fluorocarbon clear coat to enhance stain resistance; Qinglong's protective agent penetrates to a depth of ≥3mm, improving stain resistance by 40%. Regular maintenance: Outdoor panels should be cleaned once per quarter, and indoor panels once every six months; for the GRC panels on Qinglong's Guangzhou Xinghewan project, the surface remains clean after 10 years of use with regular cleaning and protection. Project case: The GRC decorative moldings on the Nanning Fengjingwan project, which had cement slurry residue and oil stains from construction, were cleaned with a plastic scraper plus neutral cleaner, followed by a protective coating; after cleaning, the surface is smooth and undamaged.