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I have terribly hard water here in AZ and was tired of spending two hours wiping off water spots after washing my truck, so I bought a power washer with a tank. It holds five gallons and I have to purchase distilled water, but no more spots or even need to dry. It probably won't take off caked-on mud, but it is powerful enough for a nice wash and it came with a foam cannon. Being able to wash in my drive is also a time saver and I have lots of other uses for this as well. It can also be connected to a hose for a water source if I want to wash my siding or other equipment. Oh, and yes, even the car wash here leaves spots when using final rinse mode because they never change their filter media.