back to the topic, then: "blooming" from moisture, in my experience, results in a "haze" getting trapped in the transparent varnish, not on the surface. I'm sure I haven't seen every kind of "bloom" there is, but this doesn't look like it to me. It was never something that could be scraped off, but had to be worked out, either with careful heat or (hazardous) chemicals. Often it would just work itself out over time (as the moisture eventually evaporated), but the customer usually didn't want to wait and "suffer".
Looks to me more like acid rain at work on what automotive wax or polish may be left on the surface.
I'd also suggest gentle cleaners, like the clay bar or cleaner wax, go to polishing compound if it's really stubborn.