Possible cleaner or specific Krud Kutter recommendation please

Submitted to Product Chat

With so many formulations to chose from is there any recommendation for an outdoor cleaner for addressing the dreaded artillery fungus tiny spots that happens to disperse on our exterior siding and white composite deck rails?

We tried the deck fence formula and it was only very very mildly helpful. Hoping to find an effective silver bullet to help assist to remedy this ongoing problem.
Thank you for your time and trouble to read this.

Attached some photos from the web…we had to figure out what this strange peculiar spotting was ourselves.