Hi Patrick, It's is best if you wipe down the walls to make sure there is no dirt, or debris. I've never washed a ceiling, but probably depends on what room you're painting. If you use a paint with primer, it should be fine.
I think it is a good idea, depending on what room you are painting, if there are smokers, candles, or if there has been a long time between painting. If the walls are not washed, definitely wash around doors, light switches, etc.
I did wash my walls behind the stove and behind the kitchen sink to ensure removing grease. Other than that, no, you don't have to wash all the walls. But you do need to fill all holes and make any repairs prior to painting. Personally I prefer a true bright white on my ceilings so I use Clark Kensington's Designer White wall paint in a satin finish. Best of luck.
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Should not need to be washed unless you have a lot of grease on them.