How do I clean the machine when there is toner buildup?

Use a lint-free cloth to wipe away any dust or spilled toner from inside and outside of the unit, including toner cartridge areas; use caution not to expose surfaces like OPC drum to light (Page 26).

From the official HP Samsung Proxpress SL M4070 Laser Multifunction Printer Series manual, page 26

People also ask

What cloth should I use to clean the OPC drum?
Use a lint-free cloth to wipe away any dust or spilled toner from inside and outside of the unit, including toner cartridge areas; use caution not to expose surfaces like OPC drum to light (Page 26).
How do I safely clean toner cartridge areas?
Use a lint-free cloth to wipe away any dust or spilled toner from inside and outside of the unit, including toner cartridge areas; use caution not to expose surfaces like OPC drum to light (Page 26).
What precautions should I take when cleaning inside the printer?
Use a lint-free cloth to wipe away any dust or spilled toner from inside and outside of the unit, including toner cartridge areas; use caution not to expose surfaces like OPC drum to light (Page 26).

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