I've recently heard that soda blasting is bad news too...the issue apparentlty is if any soda is left in gaps and it gets wet, it will rust aggressivly. The best method of blasting is now considered to be plastic media blasting. Source...Austec Dry Stripping, Moorebank.
Many years ago I was told by a panel shop to mask a 1" stip around the edge of each panel and just paint strip the centre of the panel. Once the paint stripper is all cleaned up the 1" strip can be rubbed back easily to achieve a nice edge to the panel. The other advantage to this method is keeping the stripper out of the gutters and other corner area's which can be hard to clean up