We do not wash our eggs unless a customer (we have 2 out of many) requests we do it for them or if there is visible waste on it for some reason. They will keep longer not washed as the hen puts a coating on them when laid to help protect them. If she would like them washed you can do it before using....
Virtually 100% of the eggs sold in stores are washed, of course. They last 5-8 weeks in the food chain distribution system.
Washing is only necessary if the customer wishes to receive spotlessly clean eggs. ALL my customers are such people. We rarely wash the eggs we eat ourselves, unless, as southerndesert says, there is an obvious mess on them.
If the birds are kept clean then the eggs should be clean. I will wipe dirt/poo off an egg with a damp cloth if it needs it.
My friend got salmanella from a tiny piece of eggshell breaking off into the egg contents. Now she pours boiling water over them just before breaking them open to kill any bacteria on the sehell. Only if she plans on making them with runny yokes or into a mousse (aka not cooking them 'properly'). If you are going to cook the eggs thoroughly I would not worry about it as the high heat should kill any bacteria.