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The touch-free wash at my local Shell station has an undercarriage wash option, that has jets that spray up when you are driving your vehicle into the wash bay. It's kinda cool to do this with the '13 model as the water vapor 'snorts' out of the hood vents because the water is under some decent pressure.
Don't remember where I got it, but I have an extendable spray wand that sprays a fan shape.
Plan to use it on all of my vehicles when it warms up.
My Boss is a fair-weather driver, so it stays pretty clean. But a belly water spray can't hurt anything.