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Best approach to cleaning Z screw?

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Recently I have noticed a fair amount of dust and debris accumulated on the Z screw over the past few months. I would like to scrub it clean before applying more 'green grease'.

This is how I would do it: Scrub it clean with a toothbrush and WD40 ->> Wash away WD40 residue with isopropyl alcohol ->> Let it dry ->> Apply 'green grease' from the tube. Does that sound correct?

Of course, doing that without any disassembling is inconvenient (not enough space). I can take out Z motor with Z screw attached and clean it then. However, is it possible to detach Z screw from Z motor without disassembling Z motor itself? That would be very convenient but I have no idea how to do it :)

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