To clean a keyboard cleaning brush, you can follow these simple steps:

Shake off any loose debris from the brush.
Use a pair of tweezers or your fingers to gently pull out any hairs or debris caught in the bristles of the brush.
Mix a small amount of mild soap with lukewarm water in a bowl.
Dip the brush in the soapy water and swirl it around to clean the bristles.
Rinse the brush thoroughly under running water.
Squeeze out any excess water and lay the brush flat to air-dry.
It's important to note that you should avoid using hot water or harsh chemicals when cleaning your keyboard cleaning brush, as these can damage the bristles or handle. You should also avoid using the brush on delicate surfaces like LCD screens, as the bristles can scratch the surface.
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