Clean LEGO Bricks in 6 Steps: Hand-Wash Under 40°C
Wash ordinary plastic bricks with water no hotter than 40°C and a soft cloth; never immerse electronics or metal-containing pieces.
LEGO's official support recommends hand-washing ordinary bricks and avoiding high heat. Sort old stored pieces first and check product-specific instructions for stickers and special components. Supervise children around small parts.