The best way to remove paint from an aluminum window frame is with aircraft-quality paint thinner--available at most auto parts stores.
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Use a paintbrush to apply paint thinner to your aluminum window frame.
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Use a metal scrubbing pad to rub paint thinner into the window frame and scrub off the paint. Wear gloves to prevent harming your skin with the chemicals in the paint thinner.
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Rinse off the paint thinner using water.
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Repeat Steps 1 through 3 until all of the paint has been removed from the window frame.