We keep a small scrubby by the sink, at the end of each day we do rinse/wash off the eggs that have any dirt/manure/etc. on them before they go into the fridge with the rest of my food. If they are clean to begin with, they go in ,as is. We sell about 4-5 dozen a week so we're not into this as a business, more of a personal preference. Personally I clean them off for three main reasons:
1) I wouldn't want to buy eggs that appeared to be dirty, poop or mud. doesn't matter. Plus the folks we sell to are friends and they use them quickly, they aren't sitting in the store for weeks and weeks.
2) When I use them personally, I do not care to crack open a fresh egg with 'debris' on it--don't want anything to fall into the batter.
3) I don't want poop in my fridge.
Seems to be a personal preference thing, but for the last three years it's worked fine for us.