Thank you all for your kind comments.
Hi John.
I used Bilt Hamber (BH) Surfex HD at 10% dilution in a pump action spray bottle with a small amount of BH auto wash to help with foaming.
This was sprayed over a cold engine and agitated with about 8 different types/styles of brushes.
When clean, the engine was gently rinsed off using a shower pattern from a garden hose nozzle.
It was then blow dried using a Bigboi blower.
Once dry it was lightly sprayed with Aerospace 303 protectant and wiped down with a few, The Rag company, microfiber cloths. To aid dying the blower was used again.
All painted surfaces within the engine bay were then decontaminated with fallout remover, clay barred, degreased with 8% Isopropyl and coated with BH double speed wax.