Really, wow.
I have used metal scourers for over 6 years and never scratched any metal work, even built up limescale on sinks.
The thing with Harpic tolet cleaner is that it does most of the work for you and you can use either a green or metal scourer, if the limescale has built up then metal is best.
With harpic you can not leave it on long, 1 min max and then rinse off otherwise it can tarnish metal. Again although it's not what it's meant for it works a treat, just be careful, certainly makes the job easier and if you soak up with kitchen towel it's shines like new.
Regards
Martin
