Task: Design a fully automated portable, dismantleable steel galvanized truck underbody wash that uses no pumps or electrical systems at all. This is going into a mine so they will be supplying the high-pressure water, and explains why they don't want a spark-risk due to electical system (even micro-voltage systems are not acceptable). Wash must support heavy mining equipment as well as light transports.
The Problem: "$65,000?! That's far too expensive! We budgeted on $5,000. Okay, can you supply one for less than $10,000?"