Large company here that washes Oil rigs. Thats all they do. Dirt work Long hours, but hell of an income. They have 24 hours to clean it from top to bottom so the can move it to the next location. Was told they were getting around $12,000 per cleaning. They do 3-4 rigs a night. Each location has 3 hot water rigs with 12 gpm split with to guns at 6 gmp. 6 ppl washing at any giving time.