I've got a Smeg range cooker with gas hob, well over 20 years old. The cast iron racks that sit over the burners are truly disgusting, especially over the most-used rings.
Oven pride say don't use on cast iron, googling says others have done it. I'm not too worried about cosmetic damage to the finish, but I don't want to totally ruin the metal and get loads of rust or something. I definitely can't afford a new cooker.
Has anyone done this successfully? Or have horror stories that will put me off? I'm doing a little patch test now anyway.