Hi all, can anyone advise please. I've got a pair of patio doors one of which slides to open. Size about normal door height by 2300 mm total width for the two. The double glazed panels of which they consist are misted. I thought it would be possible to remove just the double glazed units from the frames and replace them. However as I look around online people are on about replacing the whole thing, i.e the frames and what they slide in as well, going on to questions of repairing internal plaster etc. etc. OK I'll buy that the frames holding the units might need to be replaced, but the whole surround, i.e. the whole thing, torn out of the brickwork and replaced? As the saying goes, "say it isn't so, Joe". Thanks in advance for any advice. - Terry.