My kids absolutely love window markers by crayola! They all take a window and make their beautiful art! It washes off easily with some water or windex and The markers last a long time if capped before storing them. Some people ask why you would want to have your child mark up your windows and I have a few reasons, number 1 why not, it's fun and adds variety rather than drawig on paper after paper. Number 2 let them do just their own bedroom windows or only the windows of your house that aren't right in the front of your house if you don't like the idea of your windows being drawn on for all to see. Number 3 it's so different then what they are used to and kids are only kids for so long. Yes it has to be cleaned up but its not much different than a lot of children's activities that need to be cleaned up after. They are large markers that last a long time and they are priced right. I recommend them for children of all ages.