Black Grate Polish

I have been trying to locate some black grate polish.

I've tried places like Bricomarché, Castorama and various large supermarkets but can't find any. It might be that I'm just looking in the wrong places - I'm assuming that I'd find it with cleaning materials or things to do with fireplaces but so far without luck.

Has anyone actually seen any of this stuff anywhere? If not, what do people do when they want to polish their black grates?

Thanks for any help you can give.

It's usually with the glass cleaning stuff.
Castorama used to stock it and I think it was in the industrial cleaning section.
Any brico will have it and I think I've seen it in Leroy Merlin too.
If you look at this link, it's called stove polish 4110
http://www.stovax.fr/accessoires/accessoires/produits_dentretien_et_de_net.aspx

Thanks for the info. I'll try next time I'm in Leroy's.