Self service car wash in London??

[Always-Honda]

I use to live in a property with a driveway so I always washed my own car. bBut now I live in a apartment I don't have that luxury anymore. I'm looking for a self service car wash in London. I don't fancy taking my car to a general car wash for the simple reason that the workers use the same old cloths to clean a million cars and then set loose on my pride and joy. And none of them know a thing about taking care when cleaning a car. In Europe they have plenty of places that offer self service car wash facilities and even the USA has coin operated car washes where you can take as long as you like. Is there any in London or even the UK for that matter??? I know some petrol stations have the self service machines but generally they are broken and have massive queues. I don't fancy getting moody looks from the car driver behind waiting for their turn to wash. lol