Seem to be a widespread problem with rubberised plastic finishes, they often turn into a gooey mess eventually for which there seems to be no obvious solution - all the usual solvents don't touch it or make it worse. Seems to happen on expensive stuff as well. Searches don't seem to throw up a cure other than a messy temporary fix with talcum powder. Some suggest IPA but this does not work IME.
As a last resort, on trying more of the assorted fluids in the garage, brake fluid seems to work well. Polishing with a cloth soaked in brake fluid seems to remove the sticky component selectively without damaging the rest of the surface - or even affecting lettering and other markings.
Anyone else tried this?
One for the FAQ perhaps?
Chris K