How clean dust and fingermarks inside screen

dear,

ive got marks on my screen in middle,they look like fingerprints but i cant clean them out,in store they told me its inside, cause hits to the backside of display...but on back ive got two visible marks but they on diferrent place than what i mean...they just said we dont know..

the other marks what look like dust is on both sides of screen.

so the question is its possible open the screen and get in the middle where the dirt is?

thank you.

Filip

ps.glossy screen