Hey Brian: Be carefull with the pressure washing, don't get too close to the logs and don't use too much pressure, it can cause more problems. If you use too much pressure the wood will raise up and it will look like it grew hair on it, then you will have to sand the logs before staining. Just a heads up to you.
Hi im Kristine Harper, regarding that matters i will suggest you to visit this website.http://www.procleaningsydney.com.au.
Hope it can help ;).