Regarding logos on glasses. We have many that have washed off, or at least made them very thin, nearly gone. I often wonder if that's due to using the dish washer? Or they wash off eventually anyway with careful hand washing??
I think some detergents are more aggressive than others. I washed some copper pots once, and they ended up with a white powdery film that I couldn't get rid of. I think it was the brand of dish soap