Bill Howatt
I use this on my WRC house. If using pressure washer be very careful, cedar is soft. This mix may have come from the Sikkens site a while ago.
The strange numbers are to accommodate the size of my sprayer tank.

Cedar Cleaning and Mold Removal Formula

75 ml (2.6 US ounce)TSP
1.2 L (1.25 US quart) Bleach
4.8 L (5.1 US quart) Water

Apply with sprayer and let sit for 20 minutes before rinsing.

Bill