I have many slides and negatives for scan, but it have a lot of dust and fungus. I asked for cleaning in a photo studio and the person in charge gave two bottles to me, the labels show: "NeoColor Stabilizer & Replenisher, compatible with the C-41 process" part A and part B respectively (Bottle part A contains formaldehyde and have a white liquid, bottle part B have a opaque yellow liquid). Do you know about this chemicals? How can I to use for film cleaning? I read about PEC-12 but is very hard to find here in Venezuela. Thanks for your attention.