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What was the temperature on the first time it worked and concentration mix? What was the temperature and mix the second time?

It was in the 70's both days and the first day when it worked I mixed it at about 25% F13 to 75% water.

The other days, I tried anywhere from 25% all the way to 100% in a small test area to see what would happen and it didn't change a thing. Would you think this is a problem with the chemical or does the product not work on certain types of stains?

Confident Roof Cleaning Houston TX wrote:

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F13 is the best out there for gutters. I've had gutters that no matter what I used, wouldn't come clean.

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 The first time I used it, I was completely amazed. The 2nd and 3rd time, nothing at all happened and the stains were not that severe except for one case. That led me to believe that either the product broke down, or it does not tackle certain stains.

Thanks for the replies, I'll try super clean and a few other products. I'll also try the F13 I have now without diluting much to see if that changes anything on the next job. I know I could call Bob directly, but I like to post things here in case someone searches, they might find the answer without having to call for help.

F13 works great for me. I havn't had a problem. My stuff is a year old and still works realy good. No problems here

70's are definitely warm enough. Sometimes you run into gutters that just don't come clean.

i have been using purple power with great success.

Gutters are kind of like women...

Phil,

     Did you brush the gutters or are you spraying on and rinsing? I love F-13. I buy it 5 gallons at a time. I brush everything when I use it. I sell the service at a premium price and brush all gutters and downspouts as a result.

     The only time I ever have any trouble with it is when I have mixed it up in a 5 gallon container to clean with and saved it for the next job. I don't know if it breaks down after it is mixed with water and is used to clean with, but sometimes I have to strengthen it or start a new batch. When I say the next job, I mean a few days later not a few hours. The most aggressive I have ever used it was 1 part F-13 to 2 parts water.