I would advise you get a good location, especially a place with space for cars, you dont want to have the cars causing traffic jam on the road because the authorities will come after you. Also, erect temporary structures, do not do much cement or block work to avoid the eye of the FCDA authorities. Finally, register your business to get some legal backing. Pay your taxes too.
This is another answer, just to demonstrate how the answer system works. Please note that answers which do not answer the question directly will be deleted. Examples of such answers could be "I dont know", "Google it" etc. Please do not answer if you do not know the answer. This section is meant to reward people for their knowledge, not for guesses. Thank you
Start by writing a business plan for your car wash business. You need a good strategy and a good location to start the business. In Abuja, the best places to operate a car wash business are places with no high car traffic so that your business may not obstruct traffic, but easily accessible from major roads. You also need a permit from your area council to operate the business. Do not forget to pay your taxes too