Blasting the dirt off a hard surface with a powerful jet of water is one of the most life affirming feelings a man can experience. The internet agrees, which is sometimes a good sign. So much so that people now video themselves pressure washing and upload it to YouTube for other pressure washing addicts to get their fill. There's even a subreddit devoted to it, Power Washing Porn. We can't deny they're on to something.
We don't know why, but it is.