Where I live right now, there is no washing of cars as it's -5F. I can want as much as I like. If I'd go to the car wash, it'd be to say hi to Jimmy my friend who lives there.

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My car is a Lambo. I only hand wash it since it's worth a million USD. The car wash accross the street is automated. I won't stick my lambo in it. I'm going to the car wash to pick up my girlfriend who works there.

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I want to wash my car because it's dirty, but my friend is currently borrowing it. He asked me to come get my car as it's at the car wash.

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The original prompt is intentionally ambigous. There are multiple correct interpretations.