Hi Richard, thanks for your reply. That article/page on cleaning, plus other extensive reading of this site has led us to believe that we were sloppy and introduced badly cleaned glass, stuck with innapropriate glue to the kiln. So despite follwing the System96 firing protocol to the letter, we failed.
So we wont be cleaning the glass in Lynx shower gel again! (joke).
This devit business, which I have now read extensively about, is a devil.
Kiln is on its way down from another firing, having been serviced, cleaned and calibrated. Glass was cleaned following your guidelines/cautions and hopefully all will be well. Let you know in 8 hours time!