[Histonet] Immunofluorescence/slide storage

[Mildred Fail]

   I have several questions related to storage of slides stained for immunofluorescence. I do know they should be viewed as soon after staining as possible, but it is not always possible for our pathologist to do so.
  How long can they be stored without loss of reactivity?
  Do you store them in the fridge?
  After storage for several days, do you see more background, less background?
  After storage does your slide appear dirty when viewing microscopically?
Thank you
Rena Fail