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Today I spoke with a client who had a plaster company spill Natural Hydraulic Lime (NHL) all over their wood windows and trim. They asked how to deal with that as the lime had burned the wood and they could not remove the stains.


If the lime had landed on the wood and was still wet a simple soapy water solution would work to remove the lime; however, this lime had dried in place and soapy water was doing nothing to ease the staining. So, a chemical reaction was necessary. For the lime, the agent in question is vinegar. A little vinegar on a sponge will remove most of the lime from the wood. It is often necessary to use a scraper to remove the excess lime and then the vinegar to clean up the wood. If the staining is deeper than the vinegar can handle, a light sanding may be required. So, always keep a little white vinegar on hand and a little patience to boot!

I am off to Central Oregon tomorrow for a consulting job on a straw bale house that’s being built just outside of Bend. I’ll be sure to keep you posted on any developments.

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About the Author

Andrew Morison is a licensed contractor specializing in straw bale and green construction. He has shown thousands of people how to build their own straw bale projects through his comprehensive series of instructional straw bale, concrete foundation, and plastering DVDs. You can check these out at http://www.LearnStrawBale.com.

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