House Wash with a Ball-Valve and down-streamer

Vinyl Siding doesn't require high pressure to clean. Down-streaming the right detergents and low pressure is all that is needed. This example uses a ball-valve to apply detergent and to rinse.

How do we get the mildew off our exterior wood siding on our house? Bleach then press wash?

We have severe black mildew on our wood siding house. Can we put bleach then pressure wash? Not sure how to get it off…Any suggestions would be appreciative.