This may not apply to this company as they do not mention what kind of chemicals the use.
Be aware of chemicals use on your roof. Most roof cleaners in FL claim that chlorine-bleach cleaning is safe for the roof. Which is not true. Most roof cleaning companies use Chlorine-bleach to clean roofs because it is cheap, effective and fast. They claim that bleach is completely gone from the roof from a thorough water wash afterwards which is also false. Have you ever tried to rinse Chlorine-bleach off your hands? It remains for a few days no matter how much water or soap you put on your hands. Same with roofs. It remains for a few days which is long enough to cause damage to your roof.
Roof bleaching, as per many roofers inspections in our HOA community, have caused the roof nails to rust and the underlying paper to be destroyed. Check it yourself. Lift a shingle or tile on your roof so you can see the nails rusting and the underlayment paper disintegrating. Our HOA community has over 20 roofs failing prematurely after just 12 years of replacement. The Eco Friendly cleaned roofs are still in good shape. Our HOA president was a professional roofer for years and alerted our community years ago about this issue.