steam

I have never steam cleaned my engine before and was wondering what all would I need to avoid when doing so. Obviously I know about the fuses and electrics but is there any other main areas that steam/water should stay clear from?

Morning all, First time posting on here. Last night I discovered that there was a generous amount of steam seeping out of the bonnet. When I lifted it up, I found that the coolant tank was almost empty and that there was a hose that had snapped off the engine, which I've attached in the...