I use a Sea to Summit Folding bucket with a little Tea Tree Oil. The tea tree oil is good for a lot of things - antiseptic, antibacterial, antifungal, antiviral, insects repellent - smells okay and doesn't hurt the environment too much if at all. I recently did a 9 day tour and it was all I used for washing and bathing - though I did have access to one hot shower where I just rinsed my clothes.

This obviously requires a bit of water - about 5 litres is enough for washing and bathing - so you need to find a tap or a stream sometime during the day if you don't have access to water in camp.

The rear rack becomes the clothes line, which is not always perfect especially on dirt roads.