Faqs
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Most Common Cleaning Solution Questions From Our Clients
Will house washing damage the paint?
House washing will not of itself damage paint. However, some paints are reactive to bleach – most notably among these is Sherwin Williams Organic paint. Always test for reaction prior to spraying any painted house surface.
What causes the black stains and streaks on my roof?
The main cause of black streaks and stains on roofs is from a bacteria called Gloeocapsa magma. This bacteria feeds on the limestone and moisture found in asphalt shingle roofs. Over time they accumulate and create a dark outer coating, thus creating a black appearance. As the bacteria spreads, gravity pulls it downward, creating a smear-like stain.
What chemicals are used in roof washing?
The most common chemicals used in roof washing are sodium hypochlorite (aka, bleach) and soap. Sodium hypochlorite; otherwise known as bleach, is used for its algacidal properties, and soap for its surfactant properties. Bleach kills most all stain-causing organic material while surfactant keeps the cleaning solution wet longer allowing it to remain in contact with the surface being treated. In roof cleaning, surfactant also slows runoff by creating a more “sticky” cleaning solution.
What is the black staining on my driveway?
The black staining that develops over time on concrete driveways is a bacteria called Gloeocapsa magma. This is the same bacteria that feeds on the limestone and moisture found in asphalt shingle roofs. Over time, colonies of these bacteria accumulate and create a dark protective outer coating. And this is what creates the black appearance.
What psi is used in house washing?
The most common pressure used in house washing is around 90-150 psi and should never exceed 300 psi. A general rule of thumb is that if you can’t place your hand in the stream then the pressure is too high. While there are exceptions to this rule; such as when washing some brick, stone or concrete surfaces for example – proper house washing is generally accomplished using a soft wash method where the cleaning solution, and not pressure, is the chief mechanism of the cleaning process
