It's probably damaged but there's nothing stopping you from attempting to clean it @Alecger
Opening it up would however void the manufacturers warranty and may cause irreparable damage.
Unfortunately as this is accidental damage the warranty wouldn't come into effect.
Stand alone insurance such as Home Contents Insurance may provide cover but there could be an excess fee and your premiums may go up when renewing.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I have no affiliation with Samsung.