Did you stain with permanent marker?
Do not worry. Nothing is impossible to remove.
Here's a trick that explains how to remove those nasty stains from almost anything.
Clothes, walls, wood, carpets, furniture, whiteboards or glass, the solution exists:
1. Clothing: use hand sanitizer gel.
2. Walls: use toothpaste or hairspray.
3. Wood: use 70° alcohol.
4. Carpet: use white vinegar.
5. Furniture: use milk.
6. Whiteboard: use a pencil eraser.
7. Ceramic or glass: use 1 part toothpaste with 1 part baking soda.
8. Plastic: use a cotton swab soaked in 90° alcohol.
There you go, you can now remove a marker stain from almost everything :-)