I pull the babies and place them together in a damp paper towel lined tub. I don't actually wash them off but change the paper towels frequently. That's assuming full term, no external yolk babies. And not big belly full of yolk.
If larger external yolks, I place them in individual tubs and...
1) let them absorb if there are visible blood vessels in the umbilical. keep the baby and yolk moist. After a day I'll cut away the remaining yolk.
2) cut the yolk away if there is not visible blood vessels in the umbilical. (also, is likely harder)
To cut away.....
if any blood in umbilical, tie it off 1/2 - 3/4 " from body with dental floss. The cut just past that. Watch closely and remove dental floss before it's pulled into the body. Usually fine to leave it a day.
If no blood in umbilical, pinch it off and see if any fluids (blood or yolk) return. If the fluids do return, treat as above, if no fluids, you can simply cut away.
Still in sack, keep moist. Baby will likely come out on it's own. If you want, you can pip the sack.
Fat bellies, keep em nice and toasty to help them digest the remaining egg yolk.
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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC and still very fiesty)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
26.49 BRB
20.21 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 

