Dr. Bronners Soap.
I. Could. Not. Live. Without. It.
I use it for everything and a little goes a LONG way. It might seem pricey for a bottle but it lasts for a very long time and lathers wonderfully.
Yummy all natural organic scents too. The lavender is a personal favorite, as well as the peppermint.
I have used this soap (pure castile) for everything. I kid you not. From doing dishes by hand and in the dishwasher (just a TINY bit in the dishwasher, like a matter of 4-6 DROPS), to laundry, to washing my hair, and bubble baths for the kids, washing pets, floors, cars, everything...
It is so gentle. I can only use it to wash my lab, who has serious skin allergies.
You can buy it Whole Foods, Stop and Shop, ANY organic or natural store, and online.