Bhai u should avoid washing the car this frequently either with or without the shampoo.
Get yourself a good wax. Get it washed and then properly waxed and that should last up to a good number of days should I say atleast a month or more depending on the wax/polish you have used. And if it get dirty, use a waterless wash with a Microfibre clothe or just a slightly damp microfiber clothe. That's it.