I have a log home (D-log system) manufactured by Old Timer Log Homes in Tenn. that is no longer in business. It was built about 1994. The logs had Pittsburg exterior rez stain & wood preservative semi transparent oil in a charcoal color on them. I pressure washed the house last fall and was needing some suggestions on what to treat the logs with. All of the stain didn’t come off and I was thinking about staining over it with a color that I like and having the more rustic look. Is this OK? How d