Roof Mildew Cleaner QSE 4500

I just wanted to show you how well the Roof Cleaner QSE 4500 I had ordered from you is working. I have a picture attached which shows before (on the right) and after (to the left).
Here in Florida the roofs are not that steep so I decided to try it. I am 68 years old and roof cleaning was easy.

Over the years I have purchased multiple brands of roof cleaning chemicals from local retails stores, they all had guarantees, but none of them worked. So I have to admit that I doubted that the QSE would be any different.
When applying the roof cleaner I could immediately see the roof stains running down my white shingles, and within 5 minutes I thought "man this stuff actually works!".
That was 18 months ago, and now the stains are coming back (just like your site said they would), so I am going to clean the shingles again and start using the roof armor to prevent the stains.
Sorry for the long note, but I wanted to let you know that you roof cleaning chemicals really do work.

This year we changed our roof cleaning solution from another company's roof cleaning product to Roof QSE 4500 (which is actually less expensive).
The improvement in the appearance of the shingles, and disappearance of roof stains has been night and day! In fact now we are receiving twice as many new roof cleaning jobs from referrals as we had in past years.
We are placing a larger roof cleaner order today, but wanted to mention how impressed we are!

Roof QSE is a great product.  

I knew that I need to either replace the roof, or give this roof cleaning try. 
After looking at other roof cleaning sites, and reading your reviews (no other sites had reviews!)
I figured Roof Cleaner QSE was the best choice and was definitely cheaper than replacing the roof.
I took the top picture before cleaning the roof, the middle picture on roof cleaning day, and the bottom picture a couple weeks later.
As you can see, the results were amazing!