Engine cleaning

[plewis66]

Phoned my fvourite valeter today, and asked that he steam clean the engine of my 350i. He said he didn't want to do it, as he's has trouble with Rover V8's getting damp in the electric gubbins, and not running right for ages afterwards.
Given I can't tackle the issue this way, I'm going to have to do it with rags and bruised knuckles.
Any tips gladly received...