One thing Apple warns against on its “Cleaning your iPhone” page is compressed air — but it doesn’t say why. It turns out that cleaning with compressed air is a bit of a complex topic. In some areas of Canada and the United States, it’s illegal to use highly compressed air for cleaning purposes in work settings, and many commercial canned air products don’t use air at all but dangerous solvents. When misused, they can even spray out a liquid that could prove disastrous for your electronics.
For iPhones in particular, it seems the danger is damaging the phone’s inside. If you spray compressed air to clean your iPhone speakers and other openings, there’s a chance you could blow out the microphone. According to this user on Reddit, after using compressed air, all their microphone could pick up was static.
People consider compressed air suitable for cleaning electronics because it doesn’t use water. However, the high-pressure air can still move or damage delicate parts or turn debris into troublesome shrapnel that can cause harm. It’s best to listen to Apple on this one and avoid using canned air on your iPhone.
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