I have used Liquid Rubber many times and spent alot of time looking for instructions for cleaning the roof to assure success. I did not find much comprehensive information on line or on their containers. I called the company and was able to speak to the man that said he invented the product. He was kind enough to spend time with me explaining what works best and when I did a few coaches with his product, I was able to have a successful outcome. I have attempted to pass this along by sharing this info and my own experience to others that have inquired.
There are many topics on this forum that I have contributed to which I have spoken about how to do certain steps for a good outcome. If you PM me I am glad to repeat for you or answer any specific question you may have.