THE BIT THEY DIDN'T PUT ON THE BOX.
The £20 puff of air.
Photography shops sell specialized, anti-static "sensor cleaning rockets" for £15–£25. The exact same medical-grade silicone bulb duster is listed in scientific laboratory supply catalogs for clearing dust off microscope slides for £3–£5.
SO WHAT'S THE CATCH?
Cleanliness and valve design are important for camera sensors.
“The interesting bit isn't the badge. It's what happens when you search for the part behind it.”
THE INTERNET DETECTIVE'S CHECKLIST
Look for complete part numbers and revisions, make sure you're comparing the same quantity, and check the exact model/application. That's especially important with electrical, braking, steering, battery and other safety-related components.