Camera Sensor Cleaning: When to Swab and When to Blow
By Harrison Cameras | Published: 2026-11-02
Category: How-to Guides
Learn when to use a blower versus a sensor swab for camera sensor cleaning, and when to send your camera to a professional service.
Quick answer
Start with a rocket blower to remove loose dust. If spots persist, use a wet swab with sensor cleaning solution. For stubborn marks or if you're unsure, send your camera to a professional sensor cleaning service.
Why dust spots appear and how to confirm they're on the sensor
Dust spots become visible when shooting at small apertures like f/16 or f/22 against a plain background. To check, set your lens to a small aperture, focus at infinity, and take a photo of a clean white wall or the sky. Spots that appear in the same place on every image are likely on the sensor. If they move or disappear when you change lenses, they may be on the lens or mirror instead.
Blower vs swab: when each is appropriate
A blower is safe for loose dust and should be your first step. It won't remove sticky or baked-on particles. A wet swab is needed for those, but it requires care: use a fresh swab and the correct solution for your sensor type. If you're uncomfortable touching the sensor, a professional clean is the safer choice.
When to stop and seek professional help
If spots remain after two swab attempts, or if you see scratches or smears, stop. Further cleaning can damage the sensor or coating. Also, some cameras have sensors that are difficult to access; in those cases, a professional service is recommended. Harrison Cameras offers a sensor cleaning service with collection and delivery options.
Step-by-step sensor cleaning: from blower to swab
- Check for dust spots: Set your camera to a small aperture (f/16 or smaller), take a photo of a plain surface, and inspect the image for dark spots. Common mistake: judging dust at wide apertures where it's less visible. Use a tripod or steady surface to avoid blur.
- Use a rocket blower first: Remove the lens and hold the camera with the mount facing down. Use a rocket blower to puff air onto the sensor, keeping the nozzle outside the mount. Common mistake: using compressed air, which can spray propellant. Never insert the blower nozzle inside the camera chamber.
- Recheck for spots: Take another test photo. If spots remain, proceed to wet cleaning. If they're gone, you're done. Common mistake: skipping the recheck and assuming all dust is gone. If spots are still there, note their location for targeted cleaning.
- Perform a wet clean with a swab: Use a fresh sensor swab and the recommended cleaning solution for your sensor. Gently wipe across the sensor in one smooth pass, then use a new swab for a second pass if needed. Common mistake: reusing a swab, which can redistribute dust or scratch the sensor. Always use a new swab for each pass.
- Recheck and decide: Take another test photo. If spots persist after two swab attempts, stop and consider professional cleaning. Common mistake: repeated scrubbing, which can damage the sensor coating. Two attempts are the limit for DIY wet cleaning.
Professional sensor cleaning at Harrison Cameras
- Camera Sensor Cleaning: DSLR and mirrorless sensor cleaning service with drop-off at the Sheffield store or collect and deliver, turnaround 3-5 working days. If you're not confident cleaning the sensor yourself, this service provides a safe, professional alternative with convenient options.
Camera Sensor Cleaning
