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Boric acid is corrosive and can cause skin or respiratory irritation. Find a well-ventilated area, preferably outdoors, and spread out a drop cloth over anything that could become damaged by the acid. If you need to clean the brick indoors, choose a spot near open doors or windows. While handling boric acid, make sure to cover your eyes and any skin that will directly handle the cleaning agents. Wear goggles to protect your eyes and rubber gloves to protect your hands and forearms. Wear long-sleeved clothes, if possible, to protect as much of your skin as possible. If you have long hair, pull it back tightly in a bun or ponytail while cleaning with acid.
Lay down a drop cloth in a well-ventilated area. Put on a pair of goggles and thick, rubber gloves.