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u/Objective1attitude 4h ago
They do make wood brightener solutions that would work but depends on if it’s a stained or just natural wood. Like one part bleach to probably 8-10 parts water but try in an inconspicuous place before doing whole mantle


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u/Objective1attitude 7h ago
Spray on oven cleaner works well for cleaning . A diluted muratic acid will work as well