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Yes, carpets should be replaced after a house fire or significant smoke damage, even if they appear undamaged. Smoke, soot, particulates, and chemicals can penetrate deep into the carpet fibers and padding, making complete removal a complicated and time-consuming process. If water was used to extinguish the fire, it can also soak through the carpet and padding, creating a risk of mold and mildew growth. Due to these challenges and potential health risks, replacing the carpet is the safest and most effective solution.

Baking soda is an effective fire reduction method. However, flour and baking powder are very dangerous around flames. Flour is flammable and it can also conduct electricity. The combination can cause serious injury from electrical shock and worsen the situation by adding fuel to the fire. Baking powder is also not an option as it's also highly flammable. 

You may need to replace drywall because of smoke damage. If the drywall is covered in soot, you may be able to clean it, but it will require a lot of time and effort. You could spend hours cleaning the drywall only to find there is more damage and it needs to be replaced anyway. It’s usually easier and safer to remove the smoke-damaged drywall and replace it.

Depending on the amount of soot present, you can vacuum some of it using a brush attachment on your vacuum cleaner. Then, remove the leftovers with a mild cleaner, such as dish soap or vinegar mixed with water. Before applying a cleaning solution, saturate the bricks with clean water to prevent the cleaner from penetrating beyond the surface and causing structural damage to the bricks.