My favorite hand cleaner is a product called "Rough Touch Scrubs" made
by Dymon. This is a 10"x12" paper towel that is covered with tiny discs
of some hard substance (metal?) and soaked in a citrus-smelling solvent.
The towels come in a roll of 72 in a small plastic pail that serves you
one towel at a time through a small capped hole in the cover. These work
extremely well on most types of automotive crud, and a fresh one is
always available, unlike the shop towels I used to try to clean up with.
I find they are very easy on the skin, unusual for something that cleans
so well. They are available through many industrial supply houses. I
paid about $14 per pail, but they are WELL worth the price if you do
much wrenching. Even contains an antiseptic to help those skinned
knuckles!

Usual disclaimers.
Larry