Last week, I wrote about a conversation I had with a contractor to whom I referred as “Ray.” I told you how Ray tried to convince me that in addition to needing new shingles and gutters, I also needed to replace the fascia and soffit on my house. One thing that I didn’t tell you was that he also tried to convince me that I needed my sidewalk, concrete patio, and landscaping blocks spray-cleaned and sealed. He bragged about how he had the best equipment on the market for cleaning and sealing concrete.