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It is not recommended to use a hot water pressure washer or connect a cold water pressure washer to your home's hot water supply to clean the underside of your engine. This is because the high pressure and hot water can cause damage to the sensitive components of your engine and electrical systems, and can even strip away protective coatings and finishes.
Instead, it is recommended to use a degreaser and a wire brush to loosen up the grime and grease, followed by a regular garden hose with a spray nozzle to rinse it off. You can also use a plastic scraper or putty knife to gently remove any stubborn buildup.
If you want to use a pressure washer, it is recommended to use a cold water pressure washer with a lower PSI (pressure per square inch) setting, and to keep the wand at least 12-18 inches away from the engine components. You should also avoid spraying directly at sensitive areas such as the electrical system and alternator, and cover any exposed electrical components with plastic or tape to prevent water damage.
In any case, it is important to take care when cleaning the underside of your engine to avoid causing damage to the components, and to ensure that the engine is properly dried off afterwards to prevent corrosion.
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