This is exactly the problem with all forums. Someone comes on with an idea of what they want to use and then immediately be told "You don't that, you want XXX".
So very quickly, your bucket of soapy water, rinse and shammy becomes: two buckets, a specialised shampoo matched to your car's paint, PH balanced water and a variety of drying cloths which are discarded after every wipe.
And then you need clay bars and lubes. And snow foam. And wheel brushes. and non-acidic brake dust remover. And 3m tape and an orbital polisher. And various cutting agents in different strengths. And then multiple wash mitts which are colour coded so you have one for the top of the car, another one for the swage line to the bottom of door shuts and another for bumpers and kick plates. Then you need leather cleaners. And conditioners. And windowlene won't do. It has to be Isopropyl alcohol spray. And then you need tyre dressing that doesn't just make your tyres black, it feeds them. And then you need a duplicate set of sponges and detailing brushes for under the bonnet. And a paint depth gauge. And a sunlight light. And a hermetically sealed garage which is humidity controlled. And...and... and...