If they are real dusty, only the way I know works is to wash each strip in a tray of water, soak in wetting agent, and dry. Strip by Strip. I don't know if any film clip is easier to use than others for this purpose. It is pretty tricky to dry a cut strip of 120/220 film...(posted 8260 days ago)But I think the plastic sleeves and pages (US 3-hole binding system or maybe 8cm two hole or maybe 30hole system in UK??) are not the best way to organize and protect negatives... I'm curious what systems other people are using.