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