If you want to rinse off quickly and don't have a shower available, you can consider this compact hand shower with battery.
The big advantage of this hand shower is that you don't need a power connection as it has its own battery. You can easily take it with you in a backpack when you go hiking.
Place the pump in a bucket of water or perhaps in a lake, switch it on and enjoy a nice shower. You can also hang the shower on a tent pole with the included hook or attach it to a flat surface with the suction cup.