My normal processes on Black
Wash - Duragloss Shampoo
Clay - Anything non agressive
Machine Polish as needed with Menzerna Intensive Polish and/or Final Finish
Prep paint for Sealant with Autoglym Super Resin Polish
Seal with Autoglym Extra Gloss Protection or Werkstatt Acylic Jett Trigger
Wax - Victoria Concours, Swisswax Onyx or Swissvax Best of Show (Depending on your wax budget - Under 20 quid, Under 50 quid, over 50 quid)
If no access to a machine polisher use some Menzerna PO91L by hand and then use the SRP. Also look into the Carlack Hand Polishing bundle. the polishing stage is always the most important, more so on Black
If you don't need long lasting durability and just want out and out looks, ditch the SRP and EGP/Jeffs and use a nice pre wax cleaner or Glaze and go straight to wax
Wash - Duragloss
Clay - Anything non agressive
Machine Polish as needed with Menzerna Intensive Polish and/or Final Finish
Prep paint for wax, Swissvax Cleaner Fluid or Clearkote Vannilla Moose Glaze, or Meguiars #7 Show Car Glaze
Wax - Victoria Concours, Swisswax Onyx or Swissvax Best of Show