How do you remove glass art paint when it should peel off, but it has baked on to the window due to the sun?

Cool it down first. Apply ice or ice pack and then peel off.How do you remove glass art paint when it should peel off, but it has baked on to the window due to the sun?
try a razor bladeHow do you remove glass art paint when it should peel off, but it has baked on to the window due to the sun?
i would try goo-gone, or if the room is well ventilated try goof-off. (it smells really bad) but both work great at removing just about anything.