They aren't really popular wights, from what I can tell. I haven't really seen anyone talk about working with them, and I certainly haven't.
Going by lore, I expect they would react well to flattery, especially complementing their intelligence. They are also known for being greedy, so you could bury something valuable for them to find. Of course, when all else fails, give 'em booze!
I think offerings and working with them would best be done at night, as it's written in several places that creatures from Svartalfheim turn to stone in the sun.
Depending on your take on tha whole "dokkalfar" thing , you may or may not choose treat them similarly to elves.