How To Clean Soot Off Painted Walls. Start wiping the walls and surfaces that are covered. Soot can be deposited on walls from smoke or even a poorly trimmed candle wick.
Then how should i clean them?
Do you need to clean interior walls before painting? Your first impulse may be to clean this off just as you would dirt or dust—with a damp cloth or sponge. There are cleaning solutions that may work, but typically the finish i tried cleaning the porcelain tile which is never a problem to clean but the black just spread more. Whenever i clean a mark off my walls, i leave a weird shiny patch in the paint that's really visible.