Dark Stains on Natural Stone and Exterior Facades: Why Do They Occur and How to Clean Them?

03-12-2025 12:23
Dark Stains on Natural Stone and Exterior Facades: Why Do They Occur and How to Clean Them?
Exterior Maintenance and Cleaning

Dark Stains on Natural Stone and Exterior Facades:
Why Does It Occur and How to Clean It?

Rain, snow, and humidity... Porous surfaces like natural stone, brick, concrete, and plaster bear the marks of these natural phenomena over time. Irregular wetting-drying cycles, especially on surfaces exposed to precipitation, lead to unsightly dark stains and permanent water marks.

So why do these stains occur and how can we find a permanent solution?

Dark spots on natural stonesEffects to which natural surfaces are exposed over time.

The Science Behind Blemishes: Pores and Moisture

Porous building materials (natural stone, brick, sandstone, concrete, etc.) have microscopic voids. Rainwater, dirt, mineral salts, and organic matter are absorbed into these pores.

As water dries, its dissolved substances accumulate on or below the surface. This repeated process manifests itself as irregular, dark "water spots" on the surface. Over time, these accumulations are not only an aesthetic problem but can also lead to physical and chemical deterioration (cracking, flaking, salt buildup) in the material.

Porous structure and moisture The cycle of dirt and moisture accumulating in microscopic pores.

Risks of Traditional Cleaning Methods

Many people resort to harsh chemicals (acid-based cleaners, harsh solvents) or high-pressure cleaning to tackle these stubborn stains. However, these approaches are often risky:

  • It damages the surface: It causes abrasion, discoloration or deterioration of the pore structure.
  • It is risky for the environment and human health: It contains harmful, flammable chemicals.
  • It offers a temporary solution: It cleans the stain superficially, but it cannot dissolve the dirt inside the pore; it can even push it deeper.
Risks of improper cleaning High pressure or acid cleaning may damage the surface.

Solution: Is Effective and Friendly Cleaning Possible?

Yes, it's possible! RESTORA CLEAN offers a radical solution to this dilemma. It's an innovative product that combines powerful cleaning performance with a human- and environmentally-friendly formula.

"RESTORA CLEAN; while deeply dissolving dirt, lime, rust and mold, protects nature with its biodegradable structure."

Why Make a Difference with Restora Clean?

Safety-First Formula

It does not contain harmful chemicals, flammable substances, or irritating volatile organic compounds (VOCs) that threaten human and environmental health. It is environmentally friendly with its biodegradable structure. It does not pose a skin irritation or respiratory risk, and has a low odor.

Superior Performance

It deeply dissolves dirt, limescale, rust, mold, and stubborn water stains, especially on exterior surfaces like natural stone, brick, plaster, concrete, ceramic, and tile. It penetrates pores and effectively removes stain-causing deposits. It has no corrosive effect and won't damage the surface's natural texture or color.

Practical and Economical Use

Ready to use. Easily applied with a brush, roller, or spray bottle. Offers low consumption and cost. Rinses easily with cold or hot water. Can be diluted with water for use on sensitive surfaces. Suitable for both indoor and outdoor use.

Result of Restora Clean application Deep cleaning while preserving the natural texture.

On Which Surfaces Is It Used?

RESTORA CLEAN can be used safely on a wide range of surfaces, including sandstone, marble, granite, limestone, slate, terracotta, handmade bricks, concrete, cement and lime-based plasters, tiles, terracotta, plastic, and fiberglass. (On metal surfaces, it is recommended to test a small area first.)


Dark stains and water marks on your exterior or landscaping no longer have to be a persistent nightmare.

With RESTORA CLEAN, you can restore the original beauty and health of your surfaces and make a responsible choice that protects the health of your loved ones and nature.

* Before cleaning natural stone or exterior walls, especially on valuable or sensitive surfaces, always remember to pre-test on a small, inconspicuous area.

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