Interior log home wall cleaning makes a mess, because the cleaning solution can drip down the logs. It helps to have a plastic wallpaper tray at the bottom of the wall to catch the runoff. A simple soap-and-water solution may be all that you need, or you can use bleach and water, depending on the grime buildup. Combine the cleaning materials completely to avoid discolored streaks on the walls. Wear vinyl gloves and have a second bucket full of clean water for the rinse. Dust with a clean, soft rag before you clean with the solution.
Mix It Up
Create a mixture of 1 part bleach to 5 parts water and thoroughly mix it in a 1-gallon bucket for porous woods, or use a 3-to-1 ratio for weathered wood. Apply the cleaning solution working from the bottom up. Rinse the walls completely after washing to remove all the salts in the bleach because they become a food source for fungi. Do not use this solution for spot cleaning; use just soap and water instead. You can also put the cleaning solution in a spray bottle, if preferred.
Oxalic acid products specifically designed for cleaning log walls leave deeper color in the wood than the bleach-and-water mixture, and they remove iron or rust stains. Follow the manufacturer directions for diluting the product. If you plan to finish the logs after cleaning, an oxalic acid cleaner works best for water- and solvent-based finishes. For interior log walls with finishes, you can use brand-name wood-cleaning products designed for the specific finish type.