From time to time I encounter a home with these little black specks, like raised freckles. It’s obviously most noticeable on white trim but upon inspection they are elsewhere as well.
I’ve heard a zillion explanations of what they are, but still don’t know. They are hard, and don’t rinse off with pressure and don’t wipe off with our normal cleaners, detergents, or brighteners. If you scratch it with your fingernail, some of the raised dot will scratch off but not all of it.
Does anyone know definitively what this is, and has anyone here found a practical way to remove these dots, short of sanding the surface?