I took my car into the mechanic yesterday and when I got it back the leather steering wheel was all sticky and greasy feeling, how do I remove it without damaging the leather?
Take it back to the mechanic. It’s his problem.
Well, it’s yours too, but get it on record that he greased your wheel. He may have to get you a new one, and it will be easier if you start the process tomorrow instead of later.
That said, Castrol Super Clean is a good de-greaser.
dishwashing liquid (for hand washing) is not a bleach, not caustic,
and is quite strong at dissolving greases and oils, and washing away without leaving residue.
You might then put a leather treatment on to moisturise the leather. Otherwise it might feel hard, rough , sharp, and even shrink ,crack…
The best thing is wet wipes, the kind you wipe a baby’s bum with. No truck driver would go anywhere without some in his bag.
use saddle soap to clean the leather.
apply some dubbin to put grease back in the leather.
maybe they did that for you.