Answer: If oxalic acid is not available, try a cleaner with Citric Acid. This acid is milder than Oxalic Acid, so it is appropriate for use on hardwood decks with fine details. It is also good for neutralizing the surface of your deck.
An alternative is Disodium Peroxydicarbonate Oxygen Based Bleach. This cleaner is an environmentally friendly powder and is an excellent brightener for wood decks. However, this product is not suitable for new wood and must be used within 6 hours of mixing with water.
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