I haven't tried Phoenix car wash but have tried a similar setup from Arfa Technology Park i.e Ca Butlers
https://www.facebook.com/carbutlerspk/
They are really good, however you must stand in front of them all the time guiding them, otherwise they leave the spots dirty here and there. You must not leave then unattended.
The service is otherwise perfect. I had a 2008 model car six months back and I wasn't getting good rates due to dirty interior. After getting their service, I got 50K more on it as the car started smelling fresh.