How to maintain the print head for ST425?

Here is the video to maintain the print head: 
How to maintain the print head for ST425？

Here are the steps that maintain the print head:

1. Turn printer off and allow it to cool down (about half a minute);
2. Use alcohol wipes or wipes to clean the print head marked at the following picture;
   
3. Wait 2-5 minutes until the print head dry, then turn the printer on;
4. Please use high-quality thermal label paper (such as Munbyn label paper) as much as possible to prevent the inferior label paper from peeling off and remaining on the print head, which will affect the life of the print head.