Having mostly been involved with cleaning drive-thru lanes and the like, I have been offered a job cleaning up the exterior of an older house (siding, concrete pad, and asphaly-shingle roof). I read earlier that some people use some emulsifier, or citrus cleaner, or some cherry cleaner, and even 'regular' chlorine bleach; not to forget tri-sodium phosphates..... I am sure that the owner/contractor doesn't expect the place to look like new, but he probably wants to at least have mold and mildew removed, and to see the roof a couple of shades lighter. Can I use a 6% bleach solution safelyto achieve this affect? does anybody have any help(knowledge) for me. I am supposed to be meeting this guy in the next hour or so. P.S. what would be the MINIMUM hourly or cents/square ft. price to look for? I am somewhat at a loss as to where to start the pricing as I really have only had experience in the area of cleaning concrete, in more urban areas of the east coast, whereas now I am located in a more rural setting in Missouri. Any help will be genuinly appreciated. Thanks!