Method for cleaning liquid ejection head

A method for cleaning a liquid ejection head, which includes a flow path forming member configured to form a liquid flow path, a heat generating resistive element, and a coating layer configured to cover the heat generating resistive element and configured to be in contact with the liquid, in which the heat generating resistive element is made to generate heat and the liquid is made to be ejected from ejection ports, the method comprising:

• applying a voltage to the coating layer to produce an electrochemical reaction between the coating layer and the liquid, and causing the coating layer to be eluted into the liquid, thereby removing kogation deposited on the coating layer;
• and
• causing the heat generating resistive element to generate heat and causing the liquid to foam while a voltage is applied to the coating layer continuously or intermittently, thereby eliminating air bubbles generated due to the electrochemical reaction.

A liquid ejecting apparatus comprising a liquid ejection head, comprising:

• a flow path forming member configured to form a liquid flow path, a heat generating resistive element, and a coating layer configured to cover the heat generating resistive element and configured to be in contact with the liquid, the liquid ejection head causing the heat generating resistive element to generate heat and causing the liquid to be ejected from ejection ports, the liquid ejecting apparatus applying a voltage to the coating layer continuously or intermittently to produce an electrochemical reaction between the coating layer and the liquid, and causing the coating layer to be eluted into the liquid, thereby enabling removal of kogation deposited on the coating layer, wherein
• the heat generating resistive element is made to generate heat and the liquid is made to be ejected from the ejection ports while the voltage is applied to the coating layer continuously or intermittently.