I have a log home in the Colorado mounains. Time and UV have made refinishing necessary esp. on the south facing walls with some fading and greying visible.  I used Shashco finish when new and still have enough on hand to refinish.  The question is this:  I have seen “abrasive blasting” with corn cob grit as a recommended way to remove the old finish.  One contractor wanted to redo the entire house using this and suggested 3-4 weeks with a crew of 4!  While  I am sure that this will remove the finish, will other chemical treatments such as Shashco’s CPR with light power washing work?   I would propose this cleaning for the south walls and weathered areas with refinishing to blend into the existing finish.  Thoughts anyone?