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I usually go to the car wash with several cans of foamy engine cleaner, a big floor jack, goggles, some scrapers, and the worst clothes I can find. I jack it up from one side as high as it will go so you get a pretty good angle on the whole bottom. People wonder who the nut is laying in the wet muck under his car, but...
The other plus - all the gunk goes into the car wash drains which are SUPPOSED to have grease separators and filtration systems before it goes into the city sewer. In the driveway you don't have that. Also, very high pressure at my local wash.
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