We have an 11 year old poplar log home (round hewn logs). We are almost ready for stain after removing the old stain. All of the logs are covered with a porch about 7′ deep that surrounds the house so they do not get direct weather. However, the previous homeowner did not repair a roof leak and there are a few areas where water has left a line vertically down the logs. In addition, by the time we got back to the front of the house the bottom 2 logs (from sun) had grayed. Will log renew cor