If you have a window decal that won't come off and you're afraid of scratching the glass with a razor blade, soak the decal with vinegar. Either apply it with a cloth or paint it on with a paintbrush. Let it soak in for a few minutes and it should come off easily.
If it looks like the vinegar (goof off also works well) needs to soak longer...first soak a cotton ball or pad in vinegar or goof off! and tape it over the label or decal. Anything can work as tape, scotch tape, masking tape, a bandaid!
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