During the recent roof repair, the roof cement (or tar?) leaked into the house. The contractor tied cleaning the mess first by scraping the material and than cleaning the stain by various products. Now we have an ugly, black, greasy stain on a brick and mortar (interior wall). Brick was not sealed. Since we do not want wall painted, and pressure washing or sandblasting are ruled out, the contractor seams incapable of coping with the problem. Can you help?
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