How to clean front camera

Use a lightly damp microfiber cloth.
Use light pressure to wipe the lenses with in a circular motion, with the damp microfiber cloth.
Wipe the lenses with a dry (or dry part of) microfiber cloth.

If the lenses has grime or dirt that does not go away with just water, you may isopropyl alcohol.

For a visual demonstration, see step 8 in this guide: Optimale Reinigung deines Smartphones

Good luck,

Cheers

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