Utahman - I am from there too. Worked at Executive Detail in Sugarhouse, Pioneer Detail in Draper and Firehouse in American Fork (before it became Mr Carwash)
I don't live there as of now tho
Name is Jimmy
Only reason they have the warning sticker is cuz it's a mess to clean up when water mixes with all the dirt sucked up. They jus wording it in a way that you feel like you shouldn't use the vacuum to suck up water