One of the challenges with the bigger locos is that they don't fit in the sink and the tub is too low to the ground. So I built a wash rack. It's next to the garage where I store the trains (no cars) and also only 10 feet from the RR. The area is fenced on 3 sides so is out of sight. I ran hot water pipe for the hose connection instead of the typical cold faucet. Here's a shot of the set up, the table is about 36" off the ground, 40" long and 24" wide. I spray the loco with my favorite gunk remover..let it sit a few minutes...hot water hose down...and then let it dry in the sun. The guys who come to run especially like this feature.