The key points for setting up car wash business are :-
1. Survey and Data Collection
Conduct surveys and collect data about different localities regarding Car population
Living Standards (Per capita Income) of people living around if situated in or around a residential area.
Average number of cars passing by, if situated on a busy road.
2. Area / Locality Selection
When you are finished with the survey and data collection, select an area, where you would like to start the business. ( Also take into account the car population in near future) .
Ask the Municipal corporation of your city, if they are planning start some project which may affect the car population in your business locality in near future ( Building of fly over, By - pass, etc.)