ask your neighbors, or check near silver spoon tariq road, you can find someone to come and wash your car daily at home for rs. 1500/2000 a month
Weekly wash would cost you 300/400 x 4 = 1200/1500
buy him a decent shampoo, microfiber cloths, and brush for tires that wont damage alloy rims.
most days a wet cloth would do the job.
700 is usually for a service, Top wash wont cost you more then 300/500 depending where you go and tipping.
BTW, Just received a msg for registration from Excise, if i get DO in time will pick her up today, Else tomorow morning, How is your experience so far? Miss any thing?