Microfiber cloth for a clean machine!

"Penny Lane there is a fireman. ... He likes to keep his fire engine clean. It's a clean machine." (Credit: "Penny Lane" by The Beatles.) Do you like to keep your mobile devices clean? You know you do, but it's harder when you're on travel. What's the solution? You need a microfiber cleaning cloth. My optometrist provides a free ClearSight lens cleaning kit with every pair of eyeglasses I buy, including cleaning solution and a microfiber lens cloth. The cloth works very well without the solution, and it's washable and re-usable.