Picture posting is enabled for all :)
I am with Tim on this one ..My greenhouse's get cleared out completely .They are then fumigated with a sulpher candle or fumite etc ...Then all glass, benches and nooks and crannies are washed down with Jeyes or Armatillox.. I have enough to combat in the new season without having to cope with any nasties left over from previous year ...
As for environmental concerns, sulphur is a natural product - think volcanoes!