Thanks to everyone who offered an opinion.
For now, all is working well, so will hold off doing anything.
If the time arrives when the arm no longer moves smoothly, then the suggestion to use an alcohol dampened lint-free microfiber cloth may be the safest approach to take, as per Thom_mackris.
For now, all is working well, so will hold off doing anything.
If the time arrives when the arm no longer moves smoothly, then the suggestion to use an alcohol dampened lint-free microfiber cloth may be the safest approach to take, as per Thom_mackris.