Nonnymus wrote:

If the fogging is a problem in the barn for you, pull the
glass sandwich from the frames. Cut the panes apart with a
razor knife and scrape off all the old sealant. Some
desiccants, silica gel, can be regenerated by either nuking
them in a microwave oven or oven placed on self clean.
Others need a vacuum to be dried out.

A vacuum sounds more convenient, with a small stiff hose to a hole in
the spacers between the panes that gets plugged up later? We might
connect the other end of the hose to the top of a pressure cooker,
after boiling a little water inside.

Nick