Increase the amount of SH. Increase ISO. Add just a little TSP. Add a good amount of billy bob too.

That is a bad roof. It's actually white.
I would not rinse. I'd walk away rather than rinse that roof.

Sometimes, you can't let people dictate to you how to get the job done. This is one of those cases.

The methods taught here are proven methods. I've seen it myself and I have no doubts that if you give it time and let it work you will see amazing results.

I would think adjust the mix acordingly, also if the customer definitly wants you to rinse, after doing the house and drive then rinse. If nothing else the time on the job may give you more exposure to potential customers

You can bump your ratio of sh to water up a bit, but if the 10% is fresh, it will work fine. 

Did you explain to the customer that there is a greater risk of damaging the landscaping when rinsing?  Does the customer realize that they will see results of the roof cleaning without rinsing.  You really have to educate your customer on the entire process sometimes.  They aren't always familiar with no pressure cleaning, and may think its got to be rinsed in order to come clean.  I've had several customers that were persistant as well, but I always changed there mind.  I rinsed 1 roof last year, and that was for a realtor that was having an open house.

     Exactly what Gunther said. Not rinsing actually gets the roof cleaner due to the increased dwell time and the reactivation of the Hypochlorite molecule every time it gets wet. Up to about the third or fourth rain, the roof will actually get cleaner each time, before the salt totally diminishes and is rinsed off.

Well, I guess the majority is the ruling factor. I will be contacting the customer tomorrow and let them know all the information I have gathered her, they actually brought up this site in reference.
I will also let them know that if they insist on rinsing, they will need to find someone else. I cant chance my company name.

Thank you all who have posted.

Dont stop the postings tho...I want more input from others as well.

Thanks again guys!

-- Edited by Washed-up on Sunday 21st of March 2010 11:09:05 PM

that pic was a side view. I would have to use about 10 tarps on this project

Did some research and found this quote from Chris T.



The amount of sodium hydroxide is from .5 to 1.3 percent in Sodium Hypochlorite.
I have actually collected run off from a roof cleaning, and tried to "re cycle it".
It is so weakened by it;s battle with the roof algae, it did not do much, if anything.
What is left behind on a roof, after cleaning, is basically Salt.
Now, Salt can and will damage plants, just dump a bag of rock salt on a bush, see what happens!
I have been trying for years to get Calcium Hypochlorite to work for cleaning roofs.
All that is left when it evaporates is harmless Calcium, vs Salt!

Rinsing 1/4 of the roof nearest the plant drip edges has proven to be a workable solution to the problem.

Yes, you CAN completely rinse the roof after cleaning, just allow 1/2 hour dwell time to be certain ALL algae spores are killed.
IF completely rinsing, you must be careful!
Rinse one side at a time, and do 1/2 of that side, water plants until water stannds, them, go bak and rins the rest of that side, and repeat

Just get out there a spray the love around.... U CAN DO IT!!!

The Apple Cider Sauce mixture has been the majority choice for most RCIA members. Substitute dawn with Ammonyx Lo.

TSP mixed at only 2oz/gallon is not to be feared and will greatly enhance the cleaning power of your mix. It also helps keep the roof cleaner longer.

Like everyone has mentioned before, not rinsing will give you a distinct advantage over your competitors because it will also keep the roof cleaner longer.

Go to Roof Cleaning Patents and Technical Articles thread and print out the RCIA technical bulletin and give it to your customers.

This will prove that you know what you are doing and will give your customer's roof cleaning job the best possible results and longevity without pressure or heavy rinsing.