After a fire, flammable construction materials and drywall may need to be replaced, but wood beams and masonry surfaces such as concrete and brick can often be cleaned if they are considered structurally safe, according to the National Fire Protection Association. The approach taken by a fire restoration specialist to remove soot from brick can differ based on the source of the fire, the length of time it burnt, what was consumed by the fire, the type of fire damage, and the location where the soot had gathered. The recommended cleaning procedures will be determined by these parameters, as well as the amount of square footage that has been damaged. The soot produced by flames involving diesel fuel, plastics, rubber, or other petroleum-based items is often oily, but the soot produced by fires involving wood and other construction materials might be fine powdery. Cleaning visible dust in the house with a damp mop or cloth is a good idea.