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You're talking about the kind of bath bomb with heating wire, and I personally think the harm is that it burns the skin.
Open the main switch, then uninstall the switch of the bath bomb, unscrew the various wires, wrap it, and then turn on the main power supply.
Yes. As long as these five wires are not connected to other wires (e.g. live wire, neutral wire) in advance, they can be used as you say. However, the color of the line may not be right.
The front zero line is broken. From the empty distribution box at home, start to check the bathroom, just check the zero line. It may also be that the neutral line of the distribution box is empty.
Beware of short circuits, this high-power appliance can not be cheap.
Most bath bombs with exhaust air have no maintenance value because the motor burns out due to moisture, because the motor is the most valuable, so replace it with a new one.