Dried baby wipes with hot water to rehydrate. Soap for washing clothes. Toothbrush with Eucryl tooth powder. I'll also spray some Savlon povidone iodine on the susceptible bits as a bit of prevention.
As Red says, nail clippers for longer trips. I've always used talc for my feet but have recently been warned about using it by a GP as it clogs the sweat pores up and promotes infection apparently.
It's only a risk if your doing it every day of your life. A few weeks at a time won't hurt. Having sore feet and getting blisters is a much higher risk.
And there is nothing worse than getting in to a sleeping bag and all I can smell is my stinky feet.