- 1). Use a screwdriver to loosen the screws along the edge of the vent. Remove the vent. Discard any rusty screws.
- 2). Fill a bowl with warm water and add a few drops of dish-washing liquid to create a soapy mixture. Dip a sponge in the soapy water and clean the vent to remove any dust and grime. Rinse it with clean water. Dry the vent with a cloth.
- 3). Add two parts salt and one part lemon juice in a bowl. Mix the salt and juice with a spoon until it forms a paste.
- 4). Spread the paste over the rust stains on the vent with a blunt knife or rubber spatula. Allow the paste to sit for at least 30 minutes.
- 5). Wipe the paste off the vent using a wet sponge. Most of the rust should come off during this step. Proceed to the next step if there are some lingering stains.
- 6). Soak a pumice stone in warm water and rub it on any remaining stain if you have a metal vent. If the vent is plastic, you can paint over any traces of stain. Choose a paint designed for use on plastics. The paint will cover the stain completely and there is no risk of structural compromise.
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