When we use the Tissue Tek Accu-Edge blades, we pre-clean by just
gently wiping once with a Phlebotomy prep pak, a prepackaged 70%
Isopropyl soaked pad. One pad will clean many blades.
More recently, our techs seem to prefer the new Surgipath teflon
coated blades.  They have a great edge and we do not pre-clean :-) tlb