Search around and see if theres a hand wash place near you. Here in NJ right outside NYC there are numerous hand washes, in fact, more than the automated ones!

If you have to go to an automated one, the only thing I'd check for is to see if the cover the left side of the track with plastic. If its just bare metal, it could very well scratch your rims, as older tracks were made before cars started coming with super low profile tires. The new ones have a colored plastic over the edge.