I have used two products from Lowe's that have made mold removal easy.
One is for siding and one is for the deck.
I spray it on, wait a few minutes and then hose off the yuk.
In limited areas a light brushing may be needed.
https://www.lowes.com/pd/Home-Armor-...ner/1000210743
https://www.lowes.com/pd/Mold-Armor-...ner/1000140751
The products seem to be interchangeable for my purposes.