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Most homeowners do not prefer bleach as roof-cleaning product due to its hazards. If the contractor neither confirms nor denies usage with their roof cleaning services, chances are they’re using bleach. If you plan to hire one, here are some cues that can help you determine if a contractor uses bleach:
If they assure you that they use no pressure and strictly follow the shingle manufacturers’ (ARMA) recommendations
They will advise you to wet your plants before, during, and after treatment especially when using this harmful cleaning solution
Cover your plants during the cleaning process
Uses the term “Soft Wash”
Uses sodium hypochlorite (chemical name for bleach) or SH
Uses runoff recovery system
More often than not, some roof cleaning contractors will even direly attempt to formulate their own chlorine-concentrated homemade solution consisting of phosphates, dish and laundry ingredients, and even assorted surfactants to mask the smell of the main ingredient – BLEACH. Chlorine bleach will give off hazardous, toxic fumes which may be detrimental to one’s health.
“Chlorine gas can be recognized by its pungent, irritating odor, which is like the odor of bleach. The strong smell may provide adequate warning to people that they are exposed. When chlorine gas comes into contact with moist tissues such as the eyes, throat, and lungs, an acid is produced that can damage these tissues.”
— Centers for Disease Control
Splash and Dash Method
This method is commonly done by some cleaning contractors by spraying a chemical on your roof and orienting their customers to wait for dragging weeks or months to see results. Splash and Dash operators do not engage in hands-on cleaning service and solely relies on typical consumer grade products and rain to eliminate roof-attacking organism, thus yielding minimal and unsatisfactory results.
High-pressure Power washing Method
High pressure power washing method may sound promising but will still not guarantee complete removal of roof stains. It is not as preventive as other quality methods since it leaves root systems behind and speeds up chances of the algae returning. The most destructive catch is its tendency to blow off protective granules on your shingles, thus decreasing its overall quality.