Yes, I'd like to know what 'they' use as well tbh. as that's total rubbish!

I've won many concours trophies with my car and if it's sufficiently dirty and needs a wash rather than a QD wipe down then you have to use water of some description, with washmitts and the TBM (two bucket method) as mentioned above.

Now this is going to rub some of these 'concours' people up the wrong way, but it needs saying after a comment like 'never use water' - I go to many shows (mostly Ford) and as an experienced detailer am always particularly interested in the paintwork of the concours cars on display (rather than what the undersides look like), and, apart from the odd exception of cars where I know the owners, I've yet to see one that doesn't have swirling on the paint of varying degrees. So, if these people aren't using water, they should be.