What are the steps to properly clean my HP Elitedesk 800 G4?

Unplug the computer from a power source. Use plain water with a lint-free cloth for light stains, or mild dishwashing liquid diluted in water for heavier stains. For tough stains, use isopropyl alcohol which will evaporate quickly without leaving residue. Avoid solvents and do not immerse any parts in liquids.