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Yes, limewash on brick can accumulate dust over time. Its porous nature can attract dust particles, especially in environments with high levels of dust or dirt. Additionally, if the limewash surface is left unsealed, it may be more prone to collecting dust. Additionally, incorrectly applied limewash will generate dust. Causes include applying it too thickly instead of thin layers and not allowing enough drying time between layers. Regular maintenance, such as gentle cleaning or dusting, can help mitigate dusty issues.

The white stains you see on your bricks are likely efflorescence, which is salt and lime buildup. To remove efflorescence stains, simply brush them away with a stiff brush. For larger, more stubborn stains, scrub the stains with a water-detergent solution.

On average, a quality exterior brick stain can last between 10 and 20 years, and sometimes even longer. While it will look its best for a minimum of three to five years, its total lifespan depends on several factors. These include the quality and type of stain used, the condition of the brick, and the thoroughness of the surface preparation, such as proper cleaning. Following the manufacturer's application instructions and applying a sealant as a final step is also crucial. The stain's longevity can be affected by your location, climate, and the brick's exposure to harsh weather, high traffic, and other elements. Over time, the stain may begin to fade or look dingy due to weathering, erosion, dirt, and debris. Compared to paint, brick stain generally has a longer lifespan.

The cost to install or replace brick or stone siding generally ranges from $10 to $50 per square foot. The final price depends on several factors, including the specific material type, local labor rates, and any necessary preparation work, such as removing old siding. For example, different types of stone have varying costs per square foot: natural stone ($4.50–$35), stone veneer ($11–$13), faux stone ($6–$9), and cultured or manufactured stone ($5–$8).