Using a pressure washer creates an unnecessary amount of additional waste that should be dealt with in a way that is friendly to the environment. For what it's worth, allowing the water to infiltrate your yard or run down the street into the storm drain is NOT an environmentally sound manner. When I rebuilt my engine this past june, I set up the engine stand over a childs swimming pool which I bought from Kmart for about 10 dollars. I used a blow torch, some diesel fuel, and a minmal amount of water. When I finished, several weeks later, I "bottled up" the entire accumulation of liquid and took it to the local landfill for proper and FREE disposal. The pool was fairly durable and held up without ever springing a leak.
