Bio-Friendly/Rain Activated Cleaners
This is hard to talk about without naming the actual product but I’ll do my best to describe this solution in broad terms. Several companies use a product that is promoted as completely bio-friendly and is activated by the rain. Once it’s applied it will slowly work over a period of time and will eventually clean your roof. The benefit from this rain activated process is that it has no negative impact on plants that is sometime associated with those who use a chlorine based process. The details of what’s in the product is normally hidden under the banner of a trade mark name but you can tell they are using it if they say “it’s activated by the rain and works over time”.
A bio-friendly/rain activated process is not a bad option to go with especially if you have a huge investments in plants around your home and the way your home is structured makes it difficult to manage the run off from the roof. In some extreme cases, we have actually recommended this type of solution. The negative from this rain activated process is that the roof won’t be clean after the company leaves and many people are a bit reluctant to pay someone and wait for the outcome they desire. Depending on precipitation it can actually take months verses weeks to come fully clean which may not play well if your HOA has issued you a letter mandating that you get your roof clean. I have also seen several time when the company had to come back and re-apply the solution from areas that just didn’t come clean.
From a price standpoint, the bio friendly/rain activated process seems to be at the higher end of the scale. It’s probably due to possibility of having to come back and re-apply which is expensive from a labor standpoint. It also doesn’t seem to last that long. The 2-3 companies that I have seen use this type of product normally set the customer up on a maintenance program that has the company come out every six months to re-apply. When they do come out, they are only doing spot cleaning and not re-applying to the entire roof.
This type of product is also normally applied by walking on the roof which opens your roof up to the potential for broken tiles but it does allow the company to apply less chemical since they are walking the entire roof.
Again, for those homeowner that are overly concerned about plant damage and don’t mind waiting for results, it can be a solid option for them. The customer just needs to understand it will be expensive over time and they will probably need to be put in a program to maintain their clean roof.