Hello, please follow these steps:
1. In System Settings, use the up/down arrow keys to find 【Clean Mode】. Press the 【OK】 key to enter 【Clean Mode】.
2. Place Letter or A4 paper in the paper tray.
3. Press the 【Start】 key to begin cleaning the printer.
If you wish to cancel the cleaning process midway, please press the 【Back】 key.
You can check if the cleaning was successful by printing a test pattern. If you are not satisfied, you can perform a second cleaning.