Here is what I do..
Wash my car with blue dawn dish soap.
Take the hose and wet a panel clay bar the panel with the water going on the panel. Go all over the car.
I wash the car with a mixture of meguiars gold class, meguiars shampoo.
Paint seal the car, I use a blue coral product
I an entire coat of scratch x
3 coats of meguiars nxt
3 coats of meguiars gold glass.
You can finish with meguiars paint seal.. I don't.