Heh, yeah I saw that commercial... so I tried it on some common pennies because I was bored. It really does a number on it if you leave it on too long and if the penny is old. Someone will try it on something non-crappy and really ruin it.
Heck, I tried it on my shower and had a headache for two days. USE IN A WELL VENTILATED AREA!!!! That is, take your bathroom outside first. vger