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It's difficult, but you can try removing the run off discoloring with a scrub brush and TSP Cleaner…
You can also try a wood bleach or one of the available exterior wood siding cleaning products.
To remove the dark marks on your cedar, follow these steps without risking damage to the cedar:
1. **Preparation:** Start by cleaning the surface with a mixture of mild soap and water. Gently scrub the affected areas using a soft-bristled brush to remove any surface debris.
2. **Vinegar Solution:** Create a solution using equal parts of water and white vinegar. Dampen a clean cloth with this solution and gently blot the stained areas. Vinegar is a mild acid that can help lift stains without damaging the cedar.
3. **Baking Soda Paste:** For tougher stains, make a paste using water and baking soda. Apply this paste to the dark marks and let it sit for a few hours before gently scrubbing it off with a soft brush.
4. **Oxalic Acid:** If the stains persist, you can use oxalic acid as a last resort. Mix the acid with water according to the manufacturer’s instructions and apply it to the stained areas. Be sure to wear protective gear and follow safety precautions when working with oxalic acid.
5. **Rinse and Dry:** After treating the stains, thoroughly rinse the area with clean water to remove any cleaning residues. Allow the cedar to dry completely before applying any sealant or treatment.
6. **Sealing and Maintenance:** Once the stains are removed, consider applying a suitable sealant or stain to protect the cedar from future damage. Regular maintenance, such as cleaning and resealing, can help preserve the beauty of your cedar porch.
By following these steps and being cautious with the cleaning solutions used, you can effectively remove the dark marks from your cedar screened porch without causing harm to the wood. Remember to test any cleaning method on a small, inconspicuous area first to ensure compatibility with the cedar.