windscreen out

Probably cheaper to claim for a screen on your insurance. Accidentally break the screen while trying to remove it with the biggest hammer you can find. While the glass is out, fix the rust then get ya claim in, oh and remember to specify "Heated" (y)
 
Yep you'll never be able to remove the screen and re-use it, you'll need to tie the rust remedial work in with the windscreen fitter's visit