DIY fix for stained stucco

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Q: My stucco house has never been painted, and from years of never being cleaned it is very dirty. I have had several power-wash companies look at the house. They have tried various chemicals and they do not seem to take this dirt or mold off. None of the companies has washed the house -- they have only looked at it and then refused the job. A: Your house needs more than just a good cleaning. It needs the finish refurbished. We don't doubt that your house has never been painted. But we do question that it never had what is known in the plastering trade as a "color coat." Stucco is a porous material made of water, lime and cement. If left unsealed, over many years it will become stained. That is the condition we think you face now. Your question brings back memories from our youth. We've written before that our dad was a master plasterer. He could do anything with the mud, from the finest ornate ceiling work to coating a tract home. After working Monday through Fr...