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If a coin-op wash bay is your only choice, just don't shove the wand in the engine bay and blast. Stand back a distance to where the water is just showering the engine compartment and not splashing all over the place. You also have to be more careful with covering important bits like the fuse box and the ECU.
The spray bottle suggestion made me thing of something else. There are pump sprayers of various sizes you could use too. Some are hand held and available at a detailing sites, or your could try a 1~2 gallon garden pump sprayer too. Fill them with water for rinsing.
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