If it is fogged after proper fixing with fix you know to be good, I would toss it in the trash barrel. Heat etc. can fog film over time. Only you know if it's worth buying anti-fog chemistry and fooling around. It might be educational, but that's about it. Film is relatively inexpensive - I've been poor, but not so bad that I couldn't affortd to buy a roll or 100' feet for a bulk loader. By the way, I always thought the Watson was the bes - it turned so the film did not touch anything as it was loaded. Used tost $9.95 new. I have a couple I never use, full of old Tri-X.