I mostly use Autoglym, when I get a car i wash it then go over it with 2000 compound followed by Super Resin. I try to wash the TF and the Fiat every week with a branded product. As you can see I have a small collection, but I can stop whenever I wanr to
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I have got a 5l Comma Halfords own Meguiars and Carplan Triple Wax, they all work fine.I only realised i had that much when i posed them for that shot
My experince is that the brand of car wash doesnt matter, just keep the car clean and the shine will last. You can see the 2000X Fiat behind the TF taken 2 years ago I'm finding out how much trouble I'm in with the alloys here. The Fiat looks exactly the same today I have waxed it twice in the 11 years its been here. Oh and if the car is new or just resprayed let the paint harden for at least 2 weeks a month if you can resist that long before polishing.
The TF has only been washed with the Comma in this shot, it was shiny when I got it. Since then i have used Meguiars Speed Detailer swirl X and shampoo on it, not in that order. i got a package deal on them at the Uxbridge Car Show last year. TBH I dont have an opinion between them and Autoglym.