Mystery haze on glass

[Coleman612]

I got this tank for free so surprising holds water. Everything is fine except the front of the glass has this weird smudgy white haze that won't go away. I've tried different kinds of cleaners and nothing works. Even seems to make it worse.This is not in the water but the outside of the glass. Any clue as to what it is and how I can fix it?

 

[gilpi]

Is it plexiglass or glass?

 

[rlederer]

Nova polish works wonders

 

[Coleman612]

Thank you, I'll try the polish