Our log home was built by the family around 1977. It was not stained after completion. It was stained about 20 years later with CWF cedar stain, we have not had any problems, but are concerned about your comments, the black mold when mean moisture is sealed in (right). We do apply stain every 4 years or so. Is there another oil based stained that you recommend. We are not able at this time to blast to remove it. Also is Borax laundry additive the same or similar to Borate? Thanks