quartz worktop

baking soda is alkali I think

Try bar keepers friend with a vileda magic sponge

We've tried the baking soda tip, and it seems to have helped. Slowly.
But it was commercial baking powder. What's the difference?

But most house insurance deductible is around £100 is it worth it ?

HettyMaud my son did that to ours when he was house sitting while we were on holiday. He put a hot pan on the work top, and it left a ring where it had been.

I once ruined a worktop by putting a hot pan on it. I claimed on the home insurance.

Baking soda removed oil stains from our marble front steps. We never thought it would work but it completely removed/absorbed every trace. Give it a try. Just sprinkle on a good handful and leave. Don't try to rub it in.

I have used baking soda , try a bit where you won’t see it in case it reacts with the surface

Best advise would probably come from the experts that manufactured and fitted your worktop. We have just completed having a Howdens kitchen fittted, and we too loved the look of the sparkly quarts worktops. However my husband is a right one for spilling stuff if he’s cooking, and when he puts vinegar on his chips, more actually ends up on the work surface than it does on his plate, so we ended up going for a good imitation Laminate worktop instead, on the advice of our instore designer!
Maybe the stain could be removed by a specialist company with access to chemicals and methods not available to the general public, and if expensive, the cost of the repair may be met by your house insurance company as ‘accidental damage’?

Thanks to both.
It doesn't bother me but he's really annoyed with himself.
I've read that lemon juice, or a bicarb solution can act as a gentle bleach. What do you think?

wooden board prepped by him, assuming hand made ie stained and waxed or oiled. Sadly I doubt if the stain will come out because the stain will have reacted with the resin itself and it has had time to react. Be very careful about rubbing it with anything because you are likely to get a much worse matt mark. You need to avoid any cleaners containing solvents or bleach. Barkeepers friend is the only product I would try ie a paste, left and gently wiped off

I had a brand new kitchen once and hubbie put a bottle of developing fluid on it the next day. The ring took only moments to appear and it was there for all time but you get used to it.

I have used Vim on mine. I make a paste and let it stand for a while.