We use Biogenesis' predilute (#9535-0004) at a dilution of 1:10 for 30' or 1:50 overnight.  So far, we have not had to use any pretreatment on formalin-fixed, paraffin-embedded tissue.  I have listed their address and telephone number below:

Biogenesis Inc.
P.O. Box 1016
Kingston, NH  03848

(603) 642-8302

R. Cartun