"Ken" wrote:
Any suggestions for overcoming misted sealed units, is it possible to
drill hole and allow it to dry out?


Don't drill any holes in the window if it's safety or tempered
glass!!! Apparently the drilling holes trick only really works
if you get it when it first mists up. If there's been any beads
of liquid rolling down the inside then the water marks will
always be there.

We have discussed replacing sealed units in double-glazing
a few times on here, and I have just paid to have a large
picture window unit replaced. I would consider DIYing in
the future, as the procedure itself was fairly straightforward.

I have put before/during/after pictures on a web page, along
with a brief description of the process involved, he
http://www.bat400.com/diy/repl*acing-sealed-units.htm

Al Reynolds