Anyone know where to find Christmas window wax?

When I was a kid in the 50's we used a window cleaner I seem to remember was called Glass Wax. We used stencils or painted it on to our windows to read Merry Christmas and other seasonal cheerfulness. Went on wet and dried white or light pink. Your could write in it and when coming down in the new year, only needed a dry cloth to polish the windows for a clear view of the kids in the snow. Tried to find Glass Wax to no avail. Any ideas?
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