On 29/07/2012 20:04, Roland Perry wrote:
In message , at 18:52:31 on Sun, 29 Jul
2012, Roger Mills remarked:

I think I'd take the sash out. You should just be able to remove one
vertical section of the staff bead and lift it out

Except that if it wasn't designed to open, it ain't going to lift out!

Taking the top half out might work... but I'm not about to start
chopping out beads.

Normally, taking the top half out is a pain. The inner sash is normally
the bottom one, and this is only held in place by the staff bead. No
chopping necessary, the bead just prises off. Also no need to touch the
parting bead.
It really is no big deal to reverse a lower sash every now and then for
cleaning. Mine were back to front for weeks while I was doing a bit of
restoration.