I only ever use "normal" shampoo for my car. Currently using the Meguiars NXT wash, smells gorgeous mmmmmmmmm
Another good one is Sonax, the only problem with that is it's only available from (cough)
Vauxhall dealers (cough).
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I've read some good reviews of the Meguiar's NXT wax, not wash. If the wash is anywhere as good as the wax, it should just be great. The NXT wax is, I believe, actually an acryllic finish and not a real carnauba wax. So, it's probably in direct competition with Zaino.