Lets start backwards from the order of questions you asked. if you do ANY jobs for $60 you must be one VERY broke company. The last roof job I did was over $1100. The average I have seen on the internet starts at $250 (which is still wayyyy too low) for a one story small house. $60 won't even cover your chemical cost.
You say the word "we" so I am assuming you have employees. Though based on your $60 question I doubt you carry the workman's comp you are supposed to? The rate for touching a roof can be in a roofer's classification. Expect to pay .50 cents on a dollar.
You also have to get liability insurance, which again, based on your content, seems that you do not have it. Yes, most cleaners use bleach. The strength at which it is needed to clean roofs will kill everything in its path. Get yourself covered.
There are specialty rigs made to pump chemical onto roofs.
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