Turn the tables

When the whole sensor has been covered, turn the swab over and bring it back the way you came. Ensure that each stroke across the surface of the sensor uses a fresh, clean side of the swab. This stops you re-depositing dust onto the sensor. Once you've used both sides, throw the swab away and don't reuse it.

If the swabs are smaller than the sensor and you need more than one swipe to cover the whole surface, use a fresh swab. If there's any excess solution visible on the sensor, use a fresh swab with a couple drops of fluid to remove it. Swabs are cheap enough not to stint.

The sensor should now be clean. Remove the swab and chuck it away, then exit cleaning mode and fit the lens back on. Repeat the steps in Take the Test to see the results. If dust is still showing up, repeat the cleaning process.

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