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I have black on the logs on the north side of my log home. Is this a mildew or mold, or dry rot? Do I sand it off before restaining my house? Or maybe clorox wash if it's mold? Thank you.


NEVER use bleach! You will probably have to sand it off. I'm guessing that it wash power washed before it was stained and not allowed to dry properly.

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Posted By sierrason
Logs treated with boiled linseed oil WILL turn BLACK with Mold and Mildew over time, particularly on the North Exposure where there is a higher level of Moisture and less sun. Cleaning with turpentine or mineral spirits to remove the surface film of linseed oil will remove most of the black. It is important to determine what finish or preservative was originally used prior to removing the black mold or mildew. M1 is a biodegradeable concentrate used for many exterior cleaning applications and it is available at Home Depot. I would suggest reading the instructions and if possible low pressure water with M1 instead of sanding. I hope this is helpful.!!! Good Luck