It may not be you.

There's some polymer substance that was used to create "rubberized" coatings on a lot of consumer electronics some years back that degrades to a sticky mess over time on its own. I had a Grundig G6 shortwave radio that did it badly, as well as some other devices.

I don't believe that you can "undegrade" it, but if it's the same stuff, you can manage to remove it, just leave unrubberized plastic.

I used isopropyl alcohol and a lot of elbow grease, which eventually works.

This blog mentions it:

https://swling.com/blog/2021/01/getting-the-grundig-g6-out-of-a-sticky-situation/

They recommend "Purple Power".

Tip for non-USonians: what’s sold as “Purple Power” (and “Simple Green”, and several other frequently-recommended cleaners for this sort of thing) are not necessarily the same products around the world. For example, in the US “Purple Power” is an ethylene glycol based cleaner/degreaser; here in Aus, if you ask for “Purple Power” you’ll get a sodium hydroxide based degreaser.

One will clean the gunk off your radio; the other will clean the gunk and most of the labelling off…

These guys have some recommendations of their own:

https://www.ifixit.com/News/93833/ask-ifixit-how-do-i-fix-sticky-plastics