In all seriousness, I don't think I'm that bad??
My last car was a Met Black Golf Gti and I used the full range of Autoglym products, sponges and bucket etc. I could never get a decent finish, it was always left covered in water marks and streaks. I even bought and used a Calafornian Water Blade once, OMG! they should be illegal to sell. May as well have dried it with a brillo pad.
I can really recommend the Meg's Gold Class shampoo, it leaves a fantastic finish and as long as you keep the car wet with water sheeting rather than spraying, then pad it dry with a propper drying towel it leaves a water mark free finish. They only water drips I tend to get are out of the mirrors and lower corner of the front doors.
