How to Clean a Dirty GRC Surface? Detailed Cleaning Methods and Precautions Explained

Cleaning and maintenance is a key aspect of preserving the aesthetics and durability of GRC materials. Scientific cleaning methods not only extend service life, but also ensure the lasting presentation of architectural decorative effects. As a full-chain service provider of UHPC/GRC/GRG/GRP materials with 28 years of industry experience, Qinglong Group will detail professional solutions for GRC surface cleaning based on material characteristics.

Basic Understanding Before Cleaning GRC Materials: Why It Cannot Be Treated Like Ordinary Cement Products?

As a new type of composite material, GRC (Glass Fiber Reinforced Concrete) features a unique surface texture structure and strength characteristics. Compared with ordinary cement products, GRC contains a glass fiber reinforcement layer, and excessive friction or the use of highly corrosive cleaning agents may cause fiber exposure or damage to the surface protective layer. During the preparation of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), the Qinglong technical team specially emphasized the impact of cleaning and maintenance on material durability—proper cleaning can extend the service life of GRC components by more than 20%.

Classification of GRC Surface Stains and Corresponding Cleaning Solutions

Different pollution types require differentiated cleaning strategies: daily dust accumulation can be gently wiped away with a soft brush and neutral detergent (pH 6-8); for atmospheric pollutants (such as oil smoke and vehicle exhaust), rinsing with a low-pressure water gun (pressure ≤0.3MPa) is recommended, with the water flow direction parallel to the GRC texture; for stubborn stains (such as paint and adhesives), first gently scrape with a plastic scraper, then apply a dedicated GRC cleaner (containing nano-scale surfactants) as a wet compress for 3-5 minutes before wiping. Steel wool or acidic cleaners are strictly prohibited.

Deep Cleaning Implementation Steps and Professional Tool Selection

The Qinglong GRC maintenance team recommends a four-step cleaning method: ① Surface dust removal: use a HEPA-filtered vacuum cleaner to remove floating dust; ② Local pre-treatment: targeted stain removal in heavily polluted areas; ③ Overall cleaning: use a sponge mop dipped in diluted neutral cleaner (ratio 1:20) for large-area wiping; ④ Rinse: rinse off residual cleaner with deionized water to avoid water stains. For tool selection, prioritize nylon tools with a hardness not exceeding Shore 60 to prevent scratching the surface.

Five Taboos and Precautions During the Cleaning Process

Industry practice shows that the following behaviors may cause irreversible damage to GRC: 1. High-temperature and high-pressure rinsing (temperature >50℃ or pressure >0.5MPa); 2. Using highly corrosive chemicals such as chlorine-based bleach and oxalic acid; 3. Excessive cleaning frequency (recommended once per quarter, or once every 2 months in coastal areas); 4. Neglecting joint cleaning, leading to dust infiltration; 5. Failing to dry promptly after cleaning. Qinglong recommends establishing cleaning records that document the time, method, and effect of each cleaning, combined with regular professional testing (such as surface hardness tests and water absorption tests).

Long-Term Maintenance: Full-Cycle Management from Cleaning to Protection

Maintenance of high-quality GRC systems should extend to post-cleaning treatment. Qinglong's professional protection solutions include: applying a silane impregnation agent (penetration depth ≥2mm) within 72 hours after cleaning to form a breathable waterproof layer; performing hydrophobic treatment on outdoor GRC components once a year to enhance stain resistance. It is worth noting that protective agents must be products with good compatibility with the GRC substrate, so as to avoid problems such as whitening and peeling.

As a national high-tech enterprise and a participant in GRC industry standard-setting, Qinglong has always emphasized the philosophy of "prevention first, scientific maintenance." Through standardized cleaning processes and professional technical support, the decorative aesthetics of GRC materials can be preserved while fully leveraging their advantages of light weight, high strength, and rich styling, providing long-term value assurance for building projects. For customized GRC cleaning and maintenance solutions, follow Qinglong Group's official technical column to access more in-depth industry content.