The 4 side windows can be removed in 15 minutes or less,total.Use a
22ounce claw hammer that has the claws at an almost straight curve(?).A 16
ounce claw hammer has the claw curves too steep, that will bump on the
metal.Just stick the claws between the rubber and window frame and
twist.Out, in 30 seconds.

Scrub your rubber clean with fine steel wool lubricated with soap. Gob
vasoline on the rubber and let the sun soak it into the rubber.This time
of year it takes several days.It will rejuvinate  the rubber and make it
lok almost new.

When installing the windows, use vasoline as a lubricant.It will soak into
the rubber and help make it flexable and seal better when it soaks into
the ruber.

I did this to all my exterior rubber. You can see the pop top gasket that
had this treatment two years earlier in my phto of pop top screws tha tI
sell.

Foam rubber seals  ,like in the doors, will swell up a tad,but this is
ok.It make s for a tighter door closing.Looks almost new again.

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