Hi – Last year we moved into a condo unit and it was newly painted/renovated after the last owner left. I’ve notice that shortly after we moved in that in bathroom there are brown streak coming through the paint on 2 of the walls. Wondering if we can avoid repainting and a method/product to clean this off. But if we can’t avoid it then tips to address the issue.
This could be a sign of a water leak behind the walls… you should have a Plumber check this first… as for repainting the walls, first seal the streaks locally with a heavy coat of Pigmented Shellac Sealer Primer… then finish coat with a good quality product like Sherwin Williams, and repaint the whole wall… NOW you need to avoid using a hot shower for about 2 weeks while the paint cures…Good Luck