Benzatriozole is suppossed to be the real magic bullet - not that such things really exist
I've never tried it myself as a nice fresh film seemed much easier to obtain and was cheaper - kind of defeating the point. Maybe it might work out a bit more viable for a box of 4 x 5. How many sheets do you have?

Interesting how you say you get distracted. I suffer with the same affliction. Work, real life, commitments - all get in the way of the fun stuff :-(