You can always use usual cleaning tools like Clone Stamp and Healing Brush. However for product photography I like to use Photoshop Filters and Masking. Let me show how I do it? Below you can find the simple steps:

1. Open the image and Duplicate Layer

This is 100% crop of the cosmetic brush image
2. Go to Filter/Noise/Median…

For this particular image I’ve choose radius 13. But you drug the slider until all small dust disappear.

3. Filter/Noise/Add Noise(Gaussian, Monochromatic)

Amount 1.5%

4. Filter/Blur/Gaussian Blur

Radius 0.5

Median 13, Noise 1.5, Gaussian Blur 0.5

5. Create Hidden Mask Layer → Layer Mask → Hide All and paint over the object to clean dust and even borders. Do not paint all object, only areas you want to clean.

This is the final result:

This is another example:
Median 9, Noise 0.7%, Blur 0.5

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Try it! It’s really fast and easy:-)

Best, Genia.

Source: http://www.photigy.com/product-photography-tip-the-fast-and-easy-way-to-clean-dust/
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