We paid handsomely for a lovely new quartz worktop when we did our kitchen in the summer. I thought it was meant to be very durable and hard-wearing but marks like the ones pictured have started to appear- the surface is marbles but hopefully you can see they are like grey pencil scribbles. Normal surface cleaner won’t shift them, not does Flash with bleach which I have found effective on tea and coffee stains. I can’t work out what is causing them and they are popping up all over the place.
Anyone else had a similar issue and any tips to get rid of and prevent them?