Some of the things sold for cleaning eyeglasses are pure evil. Every winter I go to the motorcycle shows, and there are always three of four booths where people are selling something called Zook. They're staffed by young men with microphones who will loudly accost any glasses wearer in the crowd walking by, and DEMAND to be allowed to clean their glasses. They put you on the spot in front of the crowd. They ruined the coating on my glasses, once. Since then I am very rude to them when they badger me, and who cares if everyone is looking? The crowd deserves to know that the stuff is destructive.
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