What’s the best way to clean embedded dirt and stains from an existing post-and-beam frame?

A. Dan Kolbert, of Kolbert Building in Portland, Maine, responds: We found the solution to this problem through trial-and-error when, as part of a major gut-rehab project, our company was asked to clean up an existing timber frame in place. The post-and-beam structure had been erected in the 1970s from pieces of other frames, and some of the...

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