Via Maria Popova, this humorous review of the Cyclone 4006 - Ultra High Pressure Hard Surface Cleaner, 40,000 psi water with Full Recovery:

It used to take me 1 1/2 hours to get to work in the morning. It takes me less than 15 minutes now and that includes stopping to get an Egg McMuffin!
My secret? Easy. I bought a Cyclone 4006. Now, if there is anyone in front of me on the road, I beep my air horn once or twice. If they don't get out of my way, I turn on the "juice". If 40,000 psi water pressure (with full recovery) is strong enough to blast off concrete curing compound from asphalt, you won't believe what it does to a Toyota Corolla! Woo hoo! Beep beep! Wooooooosh!
OK, it's a little difficult to parallel park and it doesn't go faster than 30 mph. I'll give you that. But, trust me, when you are behind the wheel of a bright yellow Cyclone 4006, these things don't really matter.
PS. It comes with an "optional remote walk-behind head." If you figure out what this is, please let me know.

To really appreciate the review, you need to see a photo of one.

The Cyclone 4006 looks like a truck wearing a gas mask

Sadly, the Cyclone 4006 is out of stock. Some days when I have to drive to work down the 101 I could really use one of these. I wonder how much it cost? I'm going to guess it wasn't available for free two-day shipping via Amazon Prime.