My mostly below ground sloped basement has many 3 of the walls with bubbled paint/cement whatever. I’m looking how to repair. I was going to take a wire brush to them , then clean with muratic acid, then paint dry-loc. Instructions on the muratic acid say to hose down the walls. I do not have a drain in the floor! Now what? The attached photo shows the area where we just removed the oil tank so you can see the unpainted wall.