Should I stain or paint my blotchy concrete?
I think the white spots are lime leaching up to the top. If the concrete stays wet, that is hard to stop. Sealing the concrete can help but it can wick up moisture from below too. I stained an interior slab and haven't had this problem but I think there is plastic below the slab. But personally I think your concrete looks fine. I would find another project to worry about.