Clean LEGO bricks safely in 6 steps
LEGO recommends hand washing ordinary bricks in water at or below 40°C and wiping electronic or metal parts separately.
Official source: Clean LEGO bricks safely in 6 steps
Original-source link card from LEGO Support
Open source ↗Dishwashers and washing machines may distort LEGO bricks. The official LEGO guidance recommends gentle hand cleaning and no high-heat drying.