I think I've posted this question before but what product are you using in the engine bay? Are you pressure hosing it and then applying something on it to give it that shine? You can PM me if you like.
BMW 135i N54 TWIN TURBO
Quarter Mile firstname.lastname@example.org - Street Tyres
Queensland Raceway Sprint 1:01:22 - Street Tyres
Queensland Raceway Clubman 1:04:74 - Street Tyres
Lakeside Raceway 1:03:97 - Street Tyres