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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.

Here's the deal with leaving used rags covered in oil-based stain lying around in a pile: Depending on the conditions, these rags can take just an hour or up to a few days to combust. The source of ignition is caused by trapped heat that can be compounded if the rags are near a heat source.

Some homeowners compare German schmear versus limewash because they look similar, though they’re different techniques. German schmear involves a thin application of mortar to stone or brick, which is then partially wiped off the surface. German schmear is more affordable ($1 to $4 per square foot), and it lasts one or two decades with minimal maintenance. As a downside, it only comes in white or gray.

You should use an angled brush to first paint the mortar lines, then go in with a high-density roller to evenly paint the bricks one at a time. You can also use a flat paintbrush to paint individual bricks, but a roller is faster and easier to use thanks to its longer handle and wider surface area for coating the bricks. To finish, go in with the paint brush for edges or hard-to-reach areas.