I'm a bit worried as a visiting child put a cup on a piano which isn't ours and its left a big mark.
I just tried mixing ash and mayonnaise and testing it on a less good piece of furniture with a similar Mark. It didn't work but I didn't read Google properly as it said to leave it overnight!
I'm wondering whether to buy a cloth from Lakeland that claims to work and has 4 out of 5 star reviews unless anyone thinks I can manage by a homemade method?!
Thanks so much for any tips