Let them soak in some lukewarm water for a couple minutes. They should easily separate.
Can't you just soak them in a tub of cold water? If there is residue, clean carefully with iso. alcohol and swab.
If paranoid, use film stabilizer after soaking in water and separating.
* I am not an expert. Use above advice at your own peril
edit: I believe Kodak says to put the negatives in a tub of cold water and into the freezer for 10 minutes and use stabilizer to further reduce chance of damage.
edit2: call B&H