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Stain under windows. After winter, the bricks under windows have white powder (efflorescence) as shown on the photo. When I bought the house last year and some contracts told me it was because the window seals had a lot cracks and the water enter the wall through the cracks. So, I redo...

After winter I found there are white triangle lines on both side walls around my brick chimney. After raining for 1-2 hours, the brick wall on both side of the chimney will have a deep color triangle area larger and lower than white triangle lines. But, I have touched the deep color area and did...