Everyone has their fav products, some cheap and some costing a fortune, personally I think the tools you use, the method and how long your prepared to devote has far more impact on the look of the car than the actual products.
I have spent hours claying, decontaminating, polishing and waxing. It's not surprising that the longer you spend doing it the better it looks.
The very basic for me is prewash with either garden spray of snowfoam lance.
Pressure wash with
low power nozzle.
2 bucket wash, one warm with shampoo one clean water fitted with Detail Guardz Dirtlock which I like to use on top of a standard scratch guard. I like Microfiber Madness Incredipads, starting at the top and working down in horizontal movements not circular..
Wheel woolies are great, I have a set bought when the Mazda below was new and they are still going.
Rinse with hose so water 'sheets' then dry with a microfibre towel, avoid chamois or water blades unless you want scratches and swirls.
Microfiber Madness Dry Me Crazy car drying towels are brilliant, start at the top then work down just dabing the paintwork. Use different towel for wheels. Wash in non bio and no softener and if they seem to lose absorbency adding white vinegar to the was can help.
My wife's Mazda was bought new and is now over 5yrs old. Much to the dealers consternation we took delivery with an inspection but asked that nothing to be touched, all protective film etc was intact and no young lad was allowed near it with a sponge ready to inflict swirls. We drove it to a detailer who did all the prep, corrective polish and sealant as
@Webbah has mentioned but using Gtechniq products. Best money I've ever spent on an 'accessory' and not much more than the crappy paint protection the dealers try to sell. (Something the size of an MP will cost, but I've seen a T6 conversion with the full treatment and it was just stunning

) No hard work here, just washing as above is all we have done to the car in that time, dirt just falls off, water still beads and sheets almost as it did when new and it's just a pleasure to wash.
We collected the inevitable car park scars over the years and recently had them rectified. We took it back for those bits treated and the rest topped up. Pics are in the detailer temp controlled shop. We're all set for another 5yrs.
Sorry for long post
