I painted my house 6 years ago. All of a sudden there are streaks stains showing up on my interior walls. Almost like someone took water and threw it against the wall. They are dry to the touch and not sticky or yellow like normal paint surfactant leaching like I’ve seen online. They stains can’t be removed I tried hot water and dawn soap and a magic eraser pad. Here is a picture of my wall in my dining room. The “streaky” shadow you see is the stain. [paint stains](https://postimg.cc/SXQGW79z) What is this from? Can it be removed or do I need to repaint?