White spots that seemed to worsen

Ok, I searched and only found one old thread that was similar but his happened after his wash and they thought it was oxidized siding.

I just did a newer house this morning and it had some small white spots on the eaves prior to my cleaning. They seemed to come off during the wash, but after it dried they were still there and almost seemed to worsen. Its a newer house so I don’t think it oxidation. I tried agitation and that didn’t seem to help either. I used 12.5 SH with elemonator DS’ed. I rinsed very good as I always do. Any thoughts?

I’ve got not clue why that is but it’s very possible that they only look worse because you wanted away all the dirt and mildew

Was it only there or all around the house?
Perhaps it’s from their water?

Its in a few spots, not all the way around.