Comment: Moss Removal from a two story ashphalt shingle home. I have read extensively on roof cleaning, so I am an educated customer. I want a roof cleaning contractor who works with Sodium Hydroxide and NOT Sodium Hydrochloride. I will want to see their MSDS sheet for the ingredients in the products that they use as well as know how they will protect my plants, what method they will use for low pressure washing during the process and that they have both workman's compensation and general liability insurance. I understand the cost for this service. I am not looking for something "cheap". I'm looking for someone who knows what they are doing and knows I have done my homework. Thank you