Know thy screen. Find out if your phone’s screen features a soil-resistant coating. If so, use a dry cloth to clean. Otherwise, use “a slightly dampened microfiber or lens-cleaning cloth.” Avoid soaps or cleansers.
Get in the crevices. Treat handhelds as you would a computer keyboard. Remove dirt using either a can of compressed air or a small brush, “like a baby’s toothbrush.” If keys remain sticky, try a premoistened electronics-cleaning wipe and work it into crevices with a fingernail or a toothpick.
Wash behind your earbuds. If the caps of your earbuds are removable, “soak them for 30 minutes in hot water” with two drops of dishwashing liquid. If not, put rubbing alcohol on a cotton swab and wipe all sides.
Protect your gear. Get screen protectors to repel scratches and dirt, and give each device its own case. Jewelry pouches work well for earbuds.
Source: Good Housekeeping