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But there is one thing you do not do, and that is you do not use a steam cleaner. Everybody says, oh, I'm going to go get my engine steam cleaned. Well, that's not what you do these days because steam can actually migrate into wire connecters under the hood, and once that happens, once it's inside, it condenses and now you have water inside that connecter. That causes corrosion. The corrosion causes check engine lights and performance problems and failed emissions and so on. So it's garden hose or a pressure washer, never a steam cleaner. If you keep the under hood clean, all of these things will not be an issue.
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http://www.mpt.org/motorweek/goss/2514.shtml
I knew I remembered hearing this on Motorweek awhile ago. I have no person al experience, but it seems like in a hybrid there are a whole lot more wire connectors to become damaged. I don't know anyone who's steam cleaned their hybrid engine, and I certainly wouldn't risk it. I would, however, consider using a pressure washer as Goss mentions in the article.