Stain on iphone 11 pro midnight green camera bump

[akmalramadhani]

Does anyone know how to clean yellowish stain on iphone 11 pro camera bump?

 

[7thson]

Assuming you already tried using a micro fiber cloth to wipe it off, try a cotton swab(or micro fiber cloth) dampened with warm water. If water isn’t cutting it try rubbing alcohol, but don’t saturate the surface, just damp. If it’s a gummy residue, you might need to let the water/alcohol soften it up a bit before you gently wipe it off. Any idea what it is on there?

 

[akmalramadhani]

Already try with micro fiber but still no luck.
I don't know what causing my iPhone yellowing