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Painted exterior brick does not usually need sealing. Brick is a porous material, so you don’t want to apply a sealant that could trap moisture inside the bricks and cause erosion and structural damage. The risk of moisture-induced damage after sealing is higher in colder climates where trapped moisture can expand if it freezes. On the other hand, it makes sense to seal really old brick or kitchen backsplashes, where moisture from cooking can weaken the brick.

The best tool for drilling into brick or mortar is a rotary hammer drill which is a large hammer drill with low rotation speed and high torque. Regular drills with a hammer function are also excellent tools for drilling into brick when the diameter of the hole is 1/2 inch or less. It might be possible to drill into brick with a standard drill if you’re only drilling a very small hole, but note that masonry work will put a lot of wear on a standard drill, and the tool may not be strong enough to get through brick.

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.

Yes, you can use a mixture of 1 tablespoon of bleach and a gallon of warm water to clean stubborn stains from brick. Do not use bleach without diluting it in water. Undiluted bleach may cause discoloration. You can use either Oxygen bleach such as OxiClean or chlorine bleach. Always wear protective gloves and eye protection when handling bleach.