If you spray the connections with WD40, or CRC beforehand, or a good application of dielectric grase, you can wash the engine pretty much without concern. Get some of the purple degreaser from the autoparts store and spray the entire engine, except the electrical connectors. Leave it on for 10-15 minutes then hose it off. I don't like using a power washer on the engine, just a strong hose nozzle.
If you have a compressor, blow off the excess water, and from around the connectors; injectors, water and fuel temp sensors, MAF plug, around the coil and distributor.
If you haven't already, change ALL your PS hoses, they will all be spongy by now.
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