Good point , its the wooden door of a display cabinet , the wood is a polished mid brown colour.
Don't know why I didn't google " removing blue marker from furniture" but Sueellen, it was a great idea . The recommendations went from , hair spray to insect repellant ... but many people recommended using an eraser ( rubber) . I have just been rubbing , and it takes quiet a bit of rubbing , but most of the ink can be removed . I need to see it in daylight before it can be called a success .
Got to go now , this eejit is going to spend Saturday night with his rubber.
pjq