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outdoor stone retaining wall advice

Jed G
2 months ago

Hi, our home has stone retaining walls that were built in 1985. They have acquired mold, a slick black slime in certain parts, and lime stains. The third photo shows what we think is the same stone on the home, but not subjected to all the elements. I’d like to clean the walls without harming the integrity or developing a washed out appearance. Could you please provide advice?

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