Apparently, the Mr. Clean "Magic Eraser" cleaning sponge by Procter & Gamble is made of melamine foam.
I just bought one of these recently for the first time. I'm going to dispose of it. I have one cat who likes to open cabinets. Can't take a chance.
I do have a set of melamine dishes from the 70s when they were so popular, but they are out of reach of any of my cats or dogs.
My Harlem used to be a nut about sponges. I had to hide them. I got a Magic Erasure sponge in the mail once. Yes, she stole and tore that one up also.

She seems to have grown out of the habit, thank Dog (or should that be cat?!)!