We cleaned some cedar shake last week that was pretty weathered and had lots of black on it. Mike at Eaco Chem recommended I use some Britenol we had in stock. I found it to be ineffective at multiple applications 4 to 1 strength. As i was in a pickle I ended up using SH and low pressure to clean it. Home owner was happy but I didnt want to use the Sh. Anyone have any success with Britenol? We generally dont do wood but this customer was insistent. Any input for the future would be appreciated; other than dont do wood.