I recall a glass cleaner that looked like "milk", it did both clean and lubricate the glass plate - it was pretty common back in the days but afaik there's just a dealer located in germany who sells a knock of of the original formula. Every know and then a customer ask if we can make the glass plate more slippery, I usually recommend olishing a drop of oil (after cleaning the glass first). Depending on what you're using the glass plate might appear slightly smeary after treatment but that does not compromise the copy/scan quality.
I don't use this much anymore. Newer CIS DF's don't need it.
NEVER ASSUME ANYTHING
you can try "white vinegar", it's cheap, it's good for everything, and it's as ecological as you want, only it smells a bit, I don't know if the customers would like it? I also use it when I wash the moka kettle for coffee, I leave some on the bottom for an hour and then I throw it, and I rinse everything with running water
Big +1 on the Rainx. That is my go to these days and I still use it from time to time, but mainly as a anti-static measure in paper paths, which it does a decent job at.
I also used Brillanize back in the day when DF belts were a thing to move paper across the exposure glass. That stuff worked great.
"You can't trust your eyes, if your mind is out of focus" --
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