Sorry, I only remember doing it once, and that on an old Canoscan 8000F directly on the glass, though I think I put down a piece of saran-wrap between the bed and film, thereby making cleaning the bed unnecessary. The film wasn't difficult to clean, but I used either dish detergent or some film wash, I don't remember which. In weak dilution I really don't think dish detergent is going to harm your film, but maybe I'm wrong on that.
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