Maybe it is me, but i am not a fan of washing my car myself.  Because this is located on a busy highway, it is always crowded and sometimes you have to wait.  it seems to me that i am constantly feeding quarters into the meter because I am not finished soaping up the car and the mony runs out.  Then, I am not finished rinsing the car and the money runs out.  I think for doing it yourself you should get a little more time for the money
                        
more