best chemical Cleaning with minimum rubbing by hand

[bomcar]

I plan to add my arsenal with either pre wax cleaner or AIO product. My three favourites are dg 501, p21s gepc, and PPCL.
Anyone who has experience with dg501 and either p21s or ppc, would you give suggestion which one has the best chemical cleaning power ? thanks. :yourrock

 

[Old Pirate]

These are all great products, but it depends on the condition of the surface of the paint.