Not stupid...my SIL had to tell me about it.....
Its a powdery cleanser kind of like Comet, but its for copper, chrome, brass, kitchen sinks, stuff like that. You make kind of a paste with it and just lightly rub it and it is fantastic! No hard elbow grease, it just makes things sparkle and shine with a lot less effort. I Love the stuff for my copper, brass and for the chrome on the vehicles. If you can find the darn stuff....try it!