Compressed air
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[![enter image description here][1]][1]

Compressed air, commonly used for electronic equipment. Sold in cans at office and electronic stores, used to blow away dust and other small particles away. A paint brush is cheaper but can clear dust from a more localised area. It helps to have a brand new brush that has never been used. 

I use compressed air and paint brushes interchangeably when taking pictures of Lego at Minifigure eye-level where dust is more prominent. 


  [1]: https://i.sstatic.net/A4GvB.jpg