Q-tip slightly dampened, with a little soap, to clean, second Q-tip, slightly dampened with no soap to rinse. Then soft cloth to dry.
Q-tip with a VERY slight dab of toothpaste (plain toothpaste, not gel, not tartar control, not whitening, just plain boring white toothpaste,) will buff out slight scratches from it, too. Do that to scratches, then clean normally.