How do you remove caravan windows

Hi there. Yes, I agree with Dodg, it's a cow of a job. But, as a retired bloke, I had the time, and did my windows one at a time; ended up doing the door frame and the corner beads as well.
Only thing to add is that I bought new self-adhesive foam strip from Clark Rubber (don't know if they operate outside SA), and I used a windscreen sealing compound that stays soft (ie does not cure like silicon). So I (a) stuck the foam strip to the window frame, then (b) buttered the foam strip with the sealer, then (c) refitted the frame, fixing quickly with new stainless screws, and finally (d) cleaned up VERY QUICKLY with turps to get rid of the HUGE amount of smeared sealer!!!!! (lots of clean rags handy!).
Hope this helps.
Incidentally, prise out the frames gently: you can easily crack a window, which adds considerably to the cost (yes, the window I broke was, naturally, the biggest and most expensive to replace).
Chris (SA)