Please note; CPR is not recommended for highly resinous woods such as Redwood or Cedar. Be sure to test any product on a sample area before applying to your home. CPR - Bring Your Logs Back to Life with CPR Log Cleaner and Wood Brightener. CPR is used to clean and brighten uncoated wood that is dirty, faded or gray from UV exposure. Mix CPR to the brightening solution strength for use on new construction just prior to staining to remove dirt and grime from logs during the building process and to break down mill glaze. Mixed at the log cleaning solution strength-use for periodic cleaning of stained logs to extend the life of your stain. One container makes 8 gallons of solution at the less aggressive cleaner strength. Used for less severe discoloration or staining or use this mixture for periodic cleaning of your home after applying stain. We recommend cleaning your logs at least once per year to extend the life of your stain. One container makes 4 gallons of solution for more aggressive cleaning at the brightener strength. Use this mixture for cleaning mill scale and dirt from raw logs prior to applying stain.