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Following a fire and after sanding, how do you remove the remaining soot marks on oak beams?

Apply a solution of hydrogen peroxide at 30 volumes diluted in a little warm water. Proceed at a time when your room will be most exposed to light to improve the process. Leave on for about 30 minutes, then brush briskly. Rinse and repeat the process until you finish your tasks. Be careful you are attacking there a long and very tedious work.

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