Epson WorkForce ST-M3000 Monochrome MFP Supertank Printer - Manual (Page 257)

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To clean the print head path, use the following:
• Several cotton swabs
• ¼ cup (60 ml) water containing 2 to 3 drops of mild dish detergent
• A small flashlight
Caution: Do not use any other liquid to clean the print head path or you may damage your product.
1. Turn off the product.
2. Unplug the power cable.
3. Disconnect any connected cables.
4. Lift up the printer cover until it clicks into place.