Michelle, thats interesting that you have cleaned porcelain with electro and have achieved good results. What was on the electro that you cleaned off? I mean, it couldn't have been rust, right?
Also, I have always "assumed", thats a bad word, that porcelain is not a conductor of electricity and so it just won't work. Also, the talk about electro damaging porcelain is that, if the porcelain is coming off and the electro gets underneath the porcelain, the electro will push off the bad porcelain, in other words if the porcelain is already coming off, the electro will intensify the coming off.
But, what you are saying does not bear that out. As for me, I have never tried electro on porcelain. So thanks for that information. :)