I attached some photos of a cedar job we did yesterday.  I think it got to a high of 45 degrees.  On on a small garage there was some tanin.  Tanin is the hardest to clean on cedar roofs.  We used woodwash on this job and it was removing the tanin very well.  It did take a little more direct pressure from my garden hose, but the important part is that it will get some results.  Everything on that area was still wet so I can't really tell final results, but I will go back when more sun to get some photos. Rest of house turned out nice.