sticky windows

I have several aluminum single pane single hung windows that were sprayed with Great Stuff when we got new siding and now they stick (I have to admit that I did the spraying and now know better). Is there a way to remedy this? Do I take out the windows and scrape out the Great Stuff, or is it too late? The windows open about 6 inches.
Thanks

 

If the interior of the windows is not trimmed, or if it is possible to remove the side trim, you can use a reciprocating saw (if you have one) or a drywall saw (keyhole saw) and cut down both sides of the rough opening to remove some foam, which might loosen the windows, which have bowed in due to the pressure of the foam. Since they are single hungs, the upper sash likely kept the outer half of the window from becoming pinched, but the inner half of the window is now hourglassed.

You might also need to add a few well placed screws through the frame of the window to pull the window back into shape. Measure with a tape measure to make the middle width the same as it is at the top and bottom. And check the sides with a straightedge to see if they are still bowed.

Great Stuff makes 2 varieties of foam. The Red can is bad for windows because of the pressure with which it expands. The blue can is made for windows and doors and is a low pressure foam. Either way, you don't want to use too much foam, and you need to be sure the item being foamed is secure so that it can't bow.