Trisodium Phosphate or Washing Soda
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Fill a bucket with 1 gallon warm water. Add 6 tbsp. trisodium phosphate or washing soda to the bucket. Trisodium phoshphate and washing soda are both mild alkalis that are effective at removing mildew. Fill a second bucket with plain water.
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Dip a scrub brush into the bucket of cleaning solution. Scrub the mildewed wood with the scrub brush and cleaner. Rinse out the scrub brush in the bucket often to avoid reapplying the mildew to the wood.
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Rinse the wood with a rag dipped in the bucket of plain water. Change the rinse water, if necessary, as it becomes soiled.
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Absorb excess moisture from the wood with a towel. Allow the wood to air-dry the rest of the way. Direct fans at the wood, if possible, to speed up the drying process.
Ammonia, Vinegar and Baking Soda
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Fill a bucket with 1 gallon warm water. Add 1 cup household ammonia, ½ cup white vinegar and ¼ cup baking soda. Fill a second bucket with plain water.
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Dip a scrub brush into the bucket of cleaning solution. Scrub the unfinished wood thoroughly to remove the mildew. Rinse out the scrub brush often while cleaning.
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Rinse the wood with a rag dipped in the bucket of plain water. Change the rinse water, if necessary, as it becomes soiled.
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Absorb excess moisture from the wood with a towel. Allow the wood to air-dry the rest of the way. Direct fans at the wood, if possible, to speed up the drying process.