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engine cleaner - horatio
Is there a spray on foam or something which will dissolve the oil in a way that it can then be washed off with a hose pipe or pressure washer (I would remove the plug leads and protect the dizzy cap etc).

How effective is the method you are going to suggest?
engine cleaner - DP
I've used Gunk engine degreaser before with good results. Comes in aerosol for spray on, or as a liquid for brush on. The aerosol seems to work pretty well - not tried the liquid.

Spray on, use a stiff bristled brush to work it into the oil, leave it for a minute or so, then rinse with a hose or watering can.

Cheers
DP
engine cleaner - Roger Jones
AutoGlym Engine & Machine Cleaner works well. It's in a spray bottle. I would be reluctant to use a pressure washer in the engine bay, even if you think the electrics are protected, but I suppose it's OK with great care. Decorators' angled brushes as useful for getting to awkward places.
engine cleaner - spikeyhead {p}
Use truckwash. Make sure you get ALL of if off., you'll need a pressure washer to achieve this.

Be very very careful where you point a pressure washer within the engine bay
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I read often, only post occasionally
engine cleaner - L'escargot
Just an observation, which I know won't help horatio at all. These days engines don't generally need a serious clean like they used to, thank goodness. At one time oil used to leak out all over. I think the breakthrough occurred in the late 1970s. Unless you know different ............... ! ;-)
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L\'escargot.
engine cleaner - Hamsafar
Last time I had a problem with an oil leak, I used Fairy Power spray and the hose on the hot tap, it was brilliant and economical.
engine cleaner - ggh1
Put a sandwich bag over the brake fluid reservoir.
engine cleaner - horatio
Thanks for all your replies, "fairy" must be the cheapest solution so far suggested, I'll have a look for that stuff next time I'm in a supermarket.
engine cleaner - ggh1
Do no use an engine degreaser over tarmac, it can dissolve the tar.