I seem to be forever doing it. Wash them before I start handling food, after handling meat, after fiddling with garlic or onions, dredging the liver we have for dinner in flour. I bet you any money whoever cooks has the cleanest hands in the household. It never seems to end. Even when I wake up, the dog is anxious for her breakfast and won't touch the dry food unless I add a morsal of yesterday's dinner which might be a piece of chicken I'd saved. It needs chopping up to spread among the dry food to entice her to gulp down some of the dry stuff as she eats and I end up with mucky hands again. Something that occurred to me the other day was that kneading bread would be an excellent way of getting your hands clean after working on the car. I'd previously found washing my hair was a superior technique to using the nail brush.