My 2.5 year old toddler is drawing on her pumpkin with a black sharpie at the kitchen island. Right before she accidentally draws on the island edge I had a thought "Why don't I ask her to continue this on my wife's huge black yoga mat?" when she makes a black line down the quartzite countertop edge.
I clean as much as I can with a damp cloth and Google how to get it off. Turns out Colgate toothpaste works wonders. I smeared it on (while she wondered why?) and 30 minutes later it was gone. I kind of wish I took a before and after shot but I was too busy.