Man, that looks like a bad, really bad engine bay. You might want to put it on some treatment program or else the dirt/grime will haunt you going forward.
Here is a recent response from Robbie at Toyota Trails (re engine cleaning)-
Much of this is common sense, but it's good to start with the basics sometimes...
" I have always felt that low pressure water would not effect most connections in a Land Cruiser. Heck they have been designed to handle water crossings and other such conditions. So one of the best things to use is simple green or the equivlant. I have seen where some of these water based cleaners have discolored Aluminum bits, so it may be best to test your cleaner you choose to use on a small area first to see the results first. All the electronic's under the hood of a cruiser are good to go, except for models with distributors. One would want to make sure these are covered up with a bag before washing(but your 100 does not have a distributor). All the connectors under the hood have a O ring seal and should keep out water (but not high pressure blast, water will pentrate the seal under HP water). Most if not all the sensors are sealed against fluids and air. So I would not worry much about them. Water cleaning out the alternator is not a bad thing, even medium pressure (like out a water gun on a low pressure hose). This can actually have a good effect on the alternator, especially after a muddy encounter of the bad kind(one where the Alternator quites working, this is usually from dirt getting between the brushes and the commutator).
Water washing out the radiator and the condenser is a good thing as well, again I would only use low to medium pressure to get the job done. If you need more pressure, it may be better to remove the radiator to clean it, rather than using high pressure and bending over the fins.
I may also be necessary to remove any belly pans under the ending to aid in cleaning(all depends on what needs and how much stuff needs to be removed).
Any engine that does not have good sealing around the spark plugs and some other vehicles with coils that do not have good sealing, I would cover these with plastic as well.
Then when all done, before moving very far, I would start the engine and allow it to idle for a couple of minutes, then rev the engine to see if all is well. I may even hold a high idle(3-4k rpm) for a minute of so, to blow out all the water from around stuff , this will also allow you to see if all is working well.
In the case of a alternator not working after a mud run. I have taken alternators out of rigs, used bucket of water to clean out small rocks and such from all areas of the alternator after some real bad mud runs. Water will not necessarily ruin a alternator.
Hope that helps. "
Robbie
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ng s
