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

GRC surface cleaning must follow the principle of "gentle, harmless treatment with stain classification." Different stains require different cleaning solutions, and incorrect cleaning can easily damage the surface texture. Drawing on extensive cleaning experience from numerous projects, Qinglong has compiled this efficient and safe cleaning guide.

I. Daily Dust Cleaning: Basic Cleaning Requires No Complex Operations

Daily dust cleaning is simple and easy to perform, requiring no professional tools. Cleaning tools: soft-bristle brush, pure cotton cloth, low-pressure water gun (water pressure ≤0.3MPa); avoid scraping with hard-bristle brushes or steel wool. Cleaning procedure: first remove surface dust with a soft-bristle brush, then gently wipe with a dampened cloth; for stubborn dust, rinse with a low-pressure water gun, directing the water at a 45° angle to the GRC surface and avoiding direct spraying at sealed joints. Cleaning frequency: once a month indoors, once every 1-2 months outdoors; high-traffic commercial complexes may appropriately increase the frequency. The Qinglong Shanghai Xinghewan project adopts this method, keeping the GRC surface clean year-round.

II. Targeted Cleaning Solutions for Different Stains

Handle stains by category to avoid damaging the GRC material. Grease stains: apply a neutral cleaner (such as diluted dishwashing liquid) to the stained area, let it sit for 5-10 minutes, wipe with a cloth, then rinse clean with water. Qinglong's special neutral cleaner quickly breaks down grease without damaging the surface. Mold stains: outdoor humid environments are prone to mold growth; wipe with bleach diluted at a ratio of 1:10, let it sit for 15 minutes, then rinse with water, avoiding prolonged contact with bleach. Graffiti stains: fresh graffiti can be wiped off with alcohol, while old graffiti may require a special graffiti remover. Qinglong once removed graffiti from GRC components on a commercial street in Guangzhou, leaving no residual traces after cleaning. Cement slurry stains: uncured cement slurry can be wiped with a damp cloth, while cured slurry requires a special cement dissolver—avoid striking it with a hammer.

III. Cleaning Precautions: Avoid These Material-Damaging Behaviors

Incorrect cleaning can severely shorten the service life of GRC. Strong acids and alkalis are prohibited: corrosive cleaners such as hydrochloric acid, sulfuric acid, and caustic soda will corrode the GRC surface, causing powdering and fading. Qinglong has handled surface damage repairs caused by strong-acid cleaning, with repair costs reaching 10 times the cleaning cost. Direct high-pressure water gun spraying is prohibited: high-pressure water guns with pressure ≥1MPa will damage the GRC surface structure and cause cracks. High-temperature cleaning is prohibited: avoid cleaning with hot water (temperature >60℃), as high temperatures accelerate GRC aging. Post-cleaning treatment: promptly wipe off surface moisture after cleaning, especially at sealed joints, to prevent moisture penetration from causing rust on connecting parts. The Qinglong Hainan International Convention and Exhibition Center project performs blow-drying after cleaning, effectively preventing water seepage.