Not discouraging the OP but for your interest Muzammil, there is a havoline Xpress lube center on my way to university in PIA society, Lhr.
I stopped by to get my car washed a few times, they use their own shampoo (havoline) and Meguiars mf clothes with a market competitive price of 250/- a wash. Still the guy told me that we often come across customers who says, bhai surf se dhoo du or 150 le lo bakion ki tarha.
Car Wash looks to be a great smb, but in most parts of cities you'll have to keep that surf and "sunsilk" shampoo with pochaa to keep the customers flowing and running cost minimal.
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