Pleased with the performance of our new hob - especially the wok ring, which we use to make big pan meals. We discovered that AO had not installed it properly (it wobbles as one of the under brackets has not been fitted). We’re following up with AO…! Otherwise it’s a powerful and good-looking hob that works for us as we cook A LOT. One thing I have noticed however and it’s just aesthetics but two of the gas rings have discoloured in under a month. I’ve used hob cleaner but the discolouration wont budge. Please advise what we can use to restore the silver colour.