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Of all the revolutionary comedians of the era such as Mort Sahl, Lenny Bruce and Shelley Berman, Nachman wrote, “Newhart was the most Everyman of them all — nonethnic, nonabrasive, non-angst-ridden, non-you-name-it. ... His mild-mannered, quizzical nature worked like a sedative for the increasing craziness of the time.”

Earlier in his comedy career, Lycett said, he preferred to make “gentle and nonabrasive” jokes “about cheese and being middle-class.”

And if there is tarnish or rust, you can use a nonabrasive cleaner that contains oxalic acid, such as the soft cleanser from Bar Keepers Friend.

If it needs a little more work, because of grease or other drips, you can wash it with warm, soapy water and a nonabrasive sponge or cloth.

“Made with soft, nonabrasive material, the Polishing Cloth cleans any Apple display, including nano-texture glass, safely and effectively,” reads Apple’s description of the cloth on its product page.