My apologies if this post is in the wrong place, but I posted last week about cleaning the exterior of a bank. I actually used to work for them a number of years ago and I really respect the president of the bank. I know he asked me to do it as a way to help get my business going and I hate to miss out on a great opportunity, but I wonder if I got myself in over my head for a first job. I stopped in over the weekend and used some detergent to test some areas. It got some of the quartz cleaner, but not what maybe it could be if you used stronger chemicals. I'm wondering if maybe they would be better off to hire some type of restoration company. This is a decades old building with custom stone work. I hate to turn it down, but I'm a one man operation and I really don't want them to look at it and think, "Well, it's cleaner than it was, but...". I was thinking I could offer to do the walk ways and drive thru instead. Does anyone have limits on what they clean? What's a good way to turn a job down without looking incompetent?