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Yes, brick should be clean before staining to ensure the best results. Dirt, dust, mold, mildew, and other substances on the brick can prevent the stain from properly adhering to it. Thoroughly cleaning the brick allows the stain to penetrate and bond to the surface more effectively. Cleaning typically involves using a pressure washer or a stiff brush with mild detergent. However, stubborn residue may require a specialized masonry cleaner.

The best way to clean creosote from brick is to hire a professional chimney sweep. However, you can use a creosote log to remove excess buildup between cleanings. You can also clean minor creosote buildup using dish soap or vinegar mixed with water.

Yes, but used or reclaimed bricks can be more brittle, cracked, or uneven than new bricks, so they’re harder to cut cleanly by hand. For that reason, you should take extra care when scoring and striking, and expect a higher chance of breakage. If a brick feels especially fragile, score deeper before attempting to split it.

Limewash can be removed from brick, but the method of removal will depend on how long the limewash has been on the brick. If the limewash has fully dried—which happens after about five days—you’ll need to use a diluted muriatic acid mixture to remove it. If there are multiple coats of limewash, you may need to apply the acid mixture several times to fully remove it from the brick.