As much as I love the idea of an automatic car wash too, I am doubtful about its success as well. You cannot compare Europe with Islamabad. Their roads and surroundings are super clean. Automatic washer works there.
Here in Pak, we need to wash under the mudguards, under the car floor etc with a lot of hard work. Automatic washer wont suffice here.
We need to note that who works on service stations? I have observed two types.
People from KPK i.e. Pashto speakers - Afghans too
As many people have warned, it is really and I mean REALLY difficult to tackle such labor until and unless you are one of them. It is a BIG BIG hurdle.
On the other hand, it is also a very lucrative business. I agree with waseef.
I would suggest xubi999 to go for an oil change business instead. It is less problematic and has good incentive too.
So, choose wisely