Take a bucket and towel to a suitable natural water source like a river / stream or lake / pond of your choice during the day. Undress there until naked and start mixing some dirt with water using the vessel you brought. Cover your whole body in mud. Let it dry before you clean yourself again. [5 NIP-Points]

Extreme Variation: Fill some water in the bucket and walk back to the car without taking off the mud before. Try using the little water of the bucket to clean yourself at your parking lot. [x3 NIP-Points]