Switch off the smartphone, the very first thing to do
Remove the back cover of the smartphone
Use a microfibre cloth to clean the lens
Do not use your finger while cleaning the lens. Rather, use a lens cleaner
You can also use a soft-bristled brush to reach those tough corners and curves to clean dust particles
Do not apply much pressure to the device
Never use any kind of cleaning liquid directly on the smartphone camera lenses
Make sure you take care of your smartphone's lens as it is exposed to everything
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