Review on Blue Car Paint Marker Pens - For All Surfaces, Including Windows, Glass, Tires, and Metal - Suitable for Cars, Trucks, Bicycles - Water-Based Wet Erase Removable Markers Pen by Amy Cook

I kick myself for not reading the other reviews more carefully. I tested it on a small section of my white car, it washed out easily. I went ahead and wrote my message on the machine, it was there for a week and when I tried wiping it down again and again with water and then a weak mixture of water and dish soap it still left a faint residue like in photos in other reviews. This is a disaster, I may have to repaint these areas! Be careful when using on a white background.