Just get some "The Must For Rust" or generic phosphoric acid from Home Depot, paint section and spray on. It turns rust back into metal (iron oxide -> iron). Just periodically re-apply as necessary.
I found it to be on some of the welds too weld3.jpg
Winnex3 could you tell us exactly where that weld is? I'd like to see if I have the same/similar issue. Although the spatter is cosmetic, based only on this image (what looks like clustered porosity, circled below), it looks to me as though the weld was reworked/repaired. In my experience such things have a funny habit of repeating themselves on the assembly line.
some guy did a test on all those corrosion inhibitors, wd version didn't do so well. I regularly use fluid film, which is really just animal fats, on my 50hp tractor, zero turn, and equipment. Fluid film didn't do well in the test either. I would still use wd40 for the water displacement, then use something else afterwards. I can't remember the guys name, it was posted on the tractor forums before. I use a lot of acids in my side hustle, I don't worry about rust. I doubt you do either living up there.
Side note: I will unlock my door and pass the cemetery gates