The 27-year-old usually cleans his screen once before each use with a spray and cloth, but "being too clean is an issue as well, " he says.

WSJ: Greasy Smudges Frustrate iPad Owners

These are intended for use in flat-panel displays (in which the tips of the nanotubes are used to spray electrons on to individual phosphor elements of the screen) and atomic-force microscopes.

ECONOMIST: Was the carbon nanotube overhyped?

Four out of five American households have at least one blue-and-yellow spray can for loosening the stubborn elbow joint under the kitchen sink or silencing the squeaky screen door.

FORBES: Johnny One-note

Four out of five American households have at least one blue-and-yellow spray can for lubricating the stubborn elbow joint under the kitchen sink or silencing the squeaky screen door.

FORBES: Greasy Coca-Cola