At the karate school I visited, students wipe down the mirrors even when the glass looked immaculate. They gave no chance for dust to accumulate. They did not think, "It's already clean." Their mindset was, "Keep it clean." As Shen-hsiu wrote, "Allow no dust ever to cling." The same is true in computers. Run the antivirus program before you have a virus. Wipe the screen down before you see dust.
— Philip Toshio Sudo, Zen Computer