I think a high-pressure wash place is fine for quick washes. To be as thorough as I would want, I would like to have a bucket that I could fill with soap and water and then hand wash, using the high-pressure hose only to fill the bucket and rinse the car off. I think that would fine, but it would be an expensive proposition, considering the machines are not cheap.
Bottom line, I just need a place where I can fill a bucket, rinse the car, and get some shade while doing it.
Sorry this thread seems awfully dumb, but it surely has to be a problem shared by many owners who reside in buildings without access to a hose.