My name's Kel.
Start by moving the bottom sash so it's centered it the opening.
With one hand push in on the jamb liner --
say -- start with the left one --
while pushing in, that is, away from the sash --
gently pull on the upper left corner of the sash.
It should by the inside guide track.
Then do the same thing on the right side.
Then come back to the left and repeat.
This time the corner of the sash should completely disengage the liner tracks and be loose. Do the other side and lower the sash so it's perpendicular to the opening.
It will pivot on pins that engage spring loaded brackets.
Twist the sash so one of the corners comes straight up.
Then do the other.
It should now be free.
Same procedure for the upper sash.
If the jamb liners are rigid and there's no play they're not tilt in sash.
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