Use white vinegar to remove residue left by masking tape on window glass where the tape has been left on for too long or has dried out quickly due to strong sunshine. Wipe over residue with well dampened soft cloth a couple of times, leave for sixty seconds or so then rub off residue using a fresh piece of your already dampened cloth. Dry and polish with a clean cloth.
Worked for me on residue which had stubbornly resisted earlier attempts and had been in place for some months.
Source: Mentioned elsewhere by others so not my idea, but not posted as a solution to this question.
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