OAKLAND, Calif — Apple this month unveiled an array of new gadgets: more powerful MacBook laptop computers, AirPod wireless headphones with longer battery life and HomePod Mini speakers in three more colors.But a different and unheralded Apple release is garnering so much interest that it has become the company’s most back-ordered new product: a $19, 6.3-by-6.3-inch cloth to wipe smudges and fingerprints off screens.The cloth, imprinted with the Apple logo in the corner, is made with “soft, nonabrasive material” to clean the screens of iPhones, iPads and MacBooks “safely and effectively,” according to the product page. The listing adds that the Polishing Cloth — capital P, capital C — is “compatible” with 88 different Apple products. For most U.S. shoppers, shipment is delayed until Jan. 11, at the earliest.Charging $19 for a piece of cloth about the size of two s …
