iPhone 6s face camera " foggy "

Hello everyone here is the thing my face iphone cam is foggy compared to other iphone 6s (watch the pictures)

Then i just saw that i had like dust in the front of my iphone like between the glass and the lens i can see it it's not all black there is like dust inside, im not a phone technician or something, but a computer one so i know how to open things etc

my questions is can i open the iphone and clean it inside ? like here inside this little thing : https://imgur.com/GKUDryR

Photo comparison between my iphone 6s and a friend one : https://imgur.com/a/g0im7

what can i do guys ?