Stained kitchen hob... Any tips?

[cmmat]

Hello!
I've recently purchased a new build... everything perfect and brand spanking new.
My sister came along and tried to help clean in the kitchen but used cilit bang on the kitchen hob.. and It's stained it completely :|
Any tips on how to get the stains off?
Here is a picture of the damage:
prnt.sc/kkj8hc

Thank you in advance

I googled this - and you’re not alone. There are lots of suggestions - good luck!