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If you research roof cleaning on the Internet you will encounter claims, counter-claims and outright confusing and conflicting information among the different roof cleaning camps.

We have attempted to provide some clarification here regarding the 4 main types of roof cleaning methods most widely available to consumers.

We think that after reading this you will have a greater understanding of roof cleaning methods in general which will assist you in determining the best roof cleaning method for you.

1) Eco-Friendly, Low-Pressure Roof Cleaning Method checkmark.jpeg

The NON-bleach, green, ECO-FRIENDLY, low pressure Roof Shampoo® roof cleaning method uses a specially formulated buffered product that is safe on all asphalt and fiberglass shingles. It will not harm any landscaping around the home, yet is 100% effective at removing algae, lichens, and moss from shingles.
No damaging high pressure is ever used and absolutely NO scrubbing or brushingClick here for the science behind the results

Our proprietary Roof Shampoo® rinsing system, along with our Roof Shampoo® eco-friendly stain removing products ensures that we clean ALL the algae, lichens and moss under the edge of every shingle.  A spray-on leave-on product, or a system that claims to use no pressure simply does not use an efficient rinse system and cannot COMPLETELY remove the algae, etc.
  With the Roof Shampoo® roof cleaning system, there is no waiting, no wondering, and no worrying if the stains will really go away.  You will see for yourself that the algae, moss, and/or lichens and their stains are completely gone before your Roof Shampoo® contractor leaves your house.

If our process costs more than just splashing bleach on the roof costs, it is because skilled technicians using the NON-bleach Roof Shampoo® roof cleaning method take the time to actually get on your roof, inspect it, and do the job right using high quality, eco-safe products and state-of-the-art equipment which really clean your roof.  Roof Shampoo® contractors are professionals who make sure they clean every square inch of your roof without damaging your shingles or your landscaping.
PLUS, our Roof Conditioner™ stain prevention product provides you with the option of a lifetime guarantee against roof stains by participating in the Annual Stain Protection Program.

2) Bleach Roof Cleaning Method xmarkredJPG.jpg

FACT:  Both Bleach and TSP will corrode metal (even in weak concentrations) and High-Strength Chlorine Bleach (Pool Chlorine) will accelerate the damage – especially when the roof is not rinsed properly.

FACT:  Bleach releases toxic Chorine Gas as it is sprayed or evaporates.

FACT: Bleach splashed on plants will permanently kill them. 


FACT: Not One Roofing Manufacturer in the U.S. recommends the high-strength chlorine bleach solutions that are being used to clean roofs by many contractors (they use it because of its low cost).

FACT: Many Contractors who use bleach also add phosphates to their mixture which is a well-known pollutant in watershed areas.  Phosphates have been banned for residential use in more than 16 states. 

FACT: Roofing manufacturers have approved safer and more effective alternatives to chlorine bleach for cleaning roofs, such as Roof Shampoo®.

Related NEWS: Click HERE to see Consumer Reports warning about roof cleaning with chlorine-bleach. 

How to determine if a roof cleaning contractor will be using bleach on your property...
Roof cleaning contractors who use bleach don't advertise or tell you that they use bleach because they know homeowners don't want bleach used around their homes.
And yet they will proudly tell you that they use no pressure or that they follow the shingle manufacturers recommendations. What they don't tell you is that those 'recommendations' were cited in an old, outdated ARMA bulletin that was published long before safer, eco-friendly solutions (Roof Shampoo®) were developed.  And NO shingle manufacturer ever recommended the high strength Chlorine-Bleach and TSP solutions that these contractors use. 
Some roof cleaning contractors, when asked if they use bleach, will dodge the question by responding that they are using sodium hypochlorite. You should know that sodium hypochlorite is the chemical name for bleach. They may even tell you they use SH, which is short for sodium hypochlorite - bleach. Some even mix fragrance in with the bleach to mask the smell. They use bleach because it is cheap and easy. They merely splash the bleach mixture on your roof and often will leave without even rinsing it off.
If you're still not sure, ask the following question just this way: "How will you protect my plants while cleaning my roof?" Any answer other than "We don't need to protect your plants because our product does not harm plants" indicates that a harmful chemical is being used. If the answer is something like "We wet down your plants before, during, and after our treatment to protect them" you should be concerned. Other indicators that harmful products are being used is the use of a runoff recovery system which attempts to suck up all runoff during the treatment into a containment vessel. Also, if you are told that your plants will be covered during the roof cleaning process, that is a clear sign that a harsh chemical is being used.

In addition, you can always ask to see the Material Safety Data Sheet (MSDS) for the chemicals being used.

3) 'Splash and Dash' Method xmarkredJPG.jpg

Some roof cleaning contractors will spray a chemical on your roof and tell you to wait for weeks or months to see the results. Products which do not require rinsing, but depend on the rain to wash away the roof-attacking organisms are designed so that the contractor does not have to get on a wet roof or use special equipment to rinse the roof. These products often take repeated applications to achieve even marginal results. Some roof cleaning businesses actually use this consumer grade product and charge you professional rates for it. We call them 'Splash and Dash' operators.

4) High Pressure Power Washing Method xmarkredJPG.jpg

Some roof cleaning contractors use high pressure power washing methods to attempt to remove roofs stains. They blast away on your roof blowing the protective granules off as they go. Not only is this method damaging to your shingles, but it's also not an effective way to remove organisms that cause roof stains. The high pressure power washing method leaves root systems behind, so the algae will often return rather quickly.

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