Buy only goatskin. I always buy the roper style glove (reinforced thumb) when I can find it. This looks close:
http://www.gemplers.com/product/8250...oatskin-Gloves
Haven't tried the Kevlar-line ones, that might be a step up:
http://www.gemplers.com/product/1050...loves-Goatskin
The man who trained me as a flatbedder told me to buy that type only, and he'd been OTR since 1959. I'm on my fourth or fifth pair in twelve years (only part of which was driving, but used hard in other work).
They'll clean up with lanolin-enriched GOJO or other cleaners; helps to treat them with something as well (like you'd use for boots; not neatsfoot oil). Be sure to work the stitching. A little occasional TLC and they seem to last forever (assuming the fingers aren't too long and get caught in something).
I always have two pairs with me to swap them out daily when working hard. I have other dedicated gloves for the nasty work (greasing fifth wheel with every trailer change).
They recover just fine from being wet, unlike deerskin (which I use for driving on cooler days), or pigskin which seems to stand up to nothing after some dirt or grease, or cowhide which just wears out.
I've tried insulated gloves for cold, wet weather, but defer to you Yanks for what to use day-after-day for that. Maybe an oversized pair and wool liners . . . .