This is a question with answer options. Goal: How do you remove whitewash from brick?

Which of the following methods is more reasonable for accomplishing this goal?

Choose from: (1). Dampen the surface of the brick or concrete you want to clean with muriatic acid and then, taking care not to splash, pour the contents of the bucket on to the surface. Leave it on the surface for 10 minutes. After this time you can rub the surface with a soft brush to remove dirt stuck in the brick or concrete.. (2). Dampen the surface of the brick or concrete you want to clean with muriatic acid and then, taking care not to splash, pour the contents of the bucket on to the surface. Leave it on the surface for 10 minutes. After this time you can rub the surface with a stiff brush to remove dirt stuck in the brick or concrete.....I think the answer is
(2).