I saw that episode as well, and intitally thoguht it would be a great idea, but where I live, the ditches and storm drains all flow into the local streams and rivers - only the Sewers are treated first before being released intot he environment. The years of grease and oil that are on a frame are going to be flowing right down your driveway and into that river unless you have some sort of containment system for all the water you are using.