Collecting the “New MOG”, Phil Benfield at AW gave me a useful hint re washing the car.
Now I may be accused of teaching grandmother to suck eggs but I thought that this might be useful to pass on.
Prior to applying any water to the car, open the bonnet and spread an old towel over the top of the engine (particularly Zetec and Duratec) to protect the spark plugs channel from water ingress/collection that will inevitably come in through the top bonnet louvres.
Wash the car as normal then following the wiping down, remove the towel before staring the engine. - Obviously!
I wish I had been given this hint seven years go when we bought our first MOG, It would have saved me a lot of hassle with changing seized plugs!