Thanks George, I did get everything off. What a process, everything is in layers. I'll try and explain what I did so as to help anyone else attempting this.
As explained in other posts, the only way to remove the A pillar chrome and the chrome strip across the top of the windshield is to remove the windshield, weatherstripping and aluminum edging. I removed my windshield from the outside, cutting the weatherstripping on both sides of the aluminum edging.
I removed the rear view mirror, sun visors and interior vinyl strip on each A pillar (held on with 2 screws).
Along the chrome across the top you can now remove the 5 chrome covers along the inside edge (two at the sun visors, one long one in the centre and one at each outside edge)
Remove 3 screws on each A pillar chrome facing forward (these are exposed once windshield is off) as well as the 6 screws securing the chrome across the top of windshield.
Remove rubber weatherstripping in channel on A pillar for side windows.
Remove 5 screws holding channel in place and remove channel (mine was held on pretty securely with a sealant so give it a tap with a rubber mallet to dislodge it).
Under the channel are 2 more screws, one at the top holding the A pillar chrome and chrome across the top and one at the bottom. Remove these screws.
You should now be able to remove the chrome piece across the top. You may need to tap it with a mallet since the outside edges may be secured with some sealant. You will need to remove the top piece before removing the A pillar chrome.
You can now remove the A pillar chrome. It is probably held on with sealant. I used a plastic scraper at the top to pry the chrome away from the A pillar. If the top is really tight try starting at the bottom. Then slowly pry the chrome off the pillar. Do not try this from the centre or you will probably bend the chrome. On mine, there was some sealant at both the top and bottom but not so much I couldn't get it to move with the plastic scraper. Once it started moving it came off relatively easily.
Now vacuum up the mess you made around the windshield, interior dash, seats and floor.
I would still like to know what sealant I should use when I put everything back together?