The initial reason we developed Log Wash™ was for cleaning finished log home exterior surfaces. We found that all of the products typically recommended for general maintenance cleaning like Spic & Span, Mr. Clean or even mild dishwashing soaps softened finished surfaces during the cleaning process. This resulted in potential finish damage, especially if a pressure washer or a brush was used. It turned out that the one thing these cleaners all had in common was their high pH. When we tried the Log Wash formulation we found that it hardened the surface of our finish system and no damage occurred to the finish - even with vigorous scrubbing. It was only later that we discovered the benefits of using Log Wash on bare wood.