Removing metal grids

Has anyone taken off metal grids off openings that are several colonial windows to make it one piece off big film and put them back on later , if so what kind of tool or technique did you use. The plastic ones are easy to get off with a 4 inch on a handle , but it's hard to get the metal ones off without cracking a window or tearing up the grids.

All I know is that if the grids are made to come off, then you can remove them farily easily without cracking glass.

Yep, metal grids are indeed a pain in the arse! If they are wider than 3/4 inch, I have never been able to successfully remove them. You usually can remove the smaller ones, I have always used my olfa, and a lil' bit of paitence. All that holds 'em on usually is just a lil' bit of silicone!