How to deal with discoloration or corrosion of stone surface caused by external pollutants?

How to deal with discoloration or corrosion of stone surface caused by external pollutants (such as acid rain, industrial pollution) during the use of stone exterior wall panel system?

To deal with discoloration or corrosion of stone surface caused by external pollutants (such as acid rain, industrial pollution), the following steps can be taken:

1. Preliminary inspection and evaluation
On-site inspection: Regularly inspect the stone surface to identify the specific location and scope of discoloration, corrosion and stains.
Pollution source analysis: Determine the pollution source and analyze the composition of acid rain and industrial pollutants in order to select appropriate cleaning methods and materials.

2. Cleaning treatment
Surface cleaning:
Warm water and neutral detergent: Use warm water and neutral detergent to clean the stone surface to remove surface dust and minor stains.
Soft brush and sponge: Use a soft brush or sponge to scrub gently. Do not use a hard brush or metal brush to avoid scratching the stone surface.
Removing stubborn stains:
Specialized stone cleaners: Use a cleaner specifically formulated for stone, following the manufacturer's instructions. Make sure to choose the right cleaner for your stone type to avoid damaging the stone.
Chemical cleaning: For severe stains, a weak acid or alkaline cleaner can be used, but use caution and avoid prolonged contact with the stone. Rinse thoroughly after cleaning.

3. Repair and protection
Surface repair:
Grinding and polishing: For minor corrosion and surface damage, the stone's finish can be restored by grinding and polishing.
Filling cracks: Use a specialized stone repair compound to fill small cracks and prevent further intrusion of moisture and contaminants.
Protective treatment:
Protective coating: After cleaning and repairing, use a high-quality stone protector for coating to create a protective barrier to prevent further erosion by acid rain and contaminants.
Regular maintenance: Reapply the protector regularly, especially in high-pollution environments, to ensure that the stone surface continues to be protected.

4. Preventive measures
Rainwater diversion: During design and construction, ensure that the drainage system of roofs, windows and other parts works effectively to reduce rainwater flowing directly on the stone surface.
Regular inspection and cleaning: Establish a regular inspection and cleaning plan to promptly detect and deal with pollution problems and avoid serious damage caused by long-term accumulation.
Environmental improvement: If possible, take measures to reduce pollution sources in the surrounding environment, such as greening, controlling industrial emissions, etc.

Through the above measures, the discoloration or corrosion problems caused by external pollutants in the stone exterior wall hanging system can be effectively handled and prevented, the service life of the stone can be extended, and the appearance of the building can be kept beautiful and tidy.