I posted something like this a week or so ago.
My hands are TRASHED from all the washing - have a baby, two other kids, and all the housework and cooking to do.
Although I haven't found a cure, I know eating foods with lots of fatty acids are good, like olive oils, butters, etc and drink lots of water (not caffeinated drinks). I also take a fish oil supplement. It helps moisturize from the inside out.
I have tried hand soaps with lotion and dish soap with moisturizers too. They do help.
When I'm really desperate, I use gloves at night, lube up with Aquaphor and sleep with them on. For my body, I've found Aveeno products help - they have an oatmeal bath powder packet and an in-shower oil that you put on after you've washed, apply it, rinse it and pat dry.
And I always have to have lip balm or Aquaphor on my lips. Esp first thing after brushing in the morning and right before bed.
I'll keep watching for more ideas.