On Wed, 06 Mar 2019 21:42:32 +0000
Peter Parry wrote:

I've removed this vile stuff from a few cameras and binoculars as well
as plastic (computer mice) using White Spirit. Doesn't harm plastic
and a microfibre cloth with copious amounts of white spirit and
patience works well.

I've done that but it makes me feel that a better solvent would reduce
the amount of scrubbing required.