Eh up Tariq. So where's this autoglym centre in Manchester? If its more Oldham then keep away. I was going to use it but changed my mind after reading some reviews and seeing where it was. Not a kind of place you'd expect to see a so called posh car wash place.
But as a polish, going back to your questions, I use Williams waterless car wash stuff as a polish only. I get great results with it and have done for years.