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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.

Cracks in the chimney can be very serious, depending on their location and size. Even small cracks can become serious over time if left unrepaired. Cracks allow heat and moisture to deteriorate your chimney and harmful carbon monoxide gas to seep into your home. Small cracks can often be caulked, while large cracked sections may require full replacement.

Limewash and whitewash do not harm surfaces if you apply them correctly. Use on non-suitable surfaces can cause issues. For instance, applying limewash or whitewash to surfaces with existing sealants or incompatible materials may lead to poor adhesion or flaking. Also, harsh cleaning agents on limewashed or whitewashed surfaces can damage the finish. Proper preparation, application, and maintenance ensure that limewash and whitewash do not harm surfaces.

The downsides of brick staining include a complex process and lengthy application. Also, if your brick is damaged or already contains a non-porous sealant or paint, staining won’t be an option as it won’t be able to absorb properly.