But we have already established you have the only none smelly C150 in the world DAR
Well, it's actually one of four I fly which isn't smelly. That's probably 'cause I fly with the door off so much, it stays aired out!
Apparently the window can be fully opened with the removal of one small screw.
Though possible, not adviseable, unless you intend it to be semi permanent. There are other pieces to remove, and a fussy spring which tries to hide inside the frame. Once free, they can bang up in flight, and be scratched or cracked when they hit the door stop on the wing underside.
The 150/152 is what it is, one of a number of good, rugged trainers, which will keep you safe, teach you well, and make you appreciate the next larger plane you get to fly!